taxonID	type	description	language	source
03C38791FFDECC338CD9F96C72FDF962.taxon	diagnosis	Diagnosis. Body size small to medium (body length 8.5 to 13.5 mm); rather slender melectine bees without patches of appressed white pubescence, metasomal terga uniformly covered with feathery appressed hairs, typical lateral hair patches of pale short pubescence on metasomal terga absent (sometimes conspicuous hair bands of yellowish to reddish brown hairs developed); marginal cell distinct longer than distance from its apex to wing tip, extending well beyond the third submarginal cell, usually slightly shorter than three submarginal cells together; scutellum convex, with distinct longitudinal carina in the middle and two ventrally curved spines laterally.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFDDCC338CD9F92075EFF80C.taxon	materials_examined	Material examined. No additional material examined. Distribution. China (Fujian, Hong Kong), Laos.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFDDCC328CD9F83976ADFEFB.taxon	materials_examined	Material examined. No additional material examined. Distribution. China (Taiwan).	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFDCCC358CD9FE4974B0FE06.taxon	materials_examined	Material examined. China, Xizang, Mêdog, Garasa (28 º 44 ′ N, 95 º 01 ′ E; elev. 1200 m), 1 ♂, 15. XI. 1982, coll. Yinheng Han; Mêdog, Madi (29 º 24 ′ N, 95 º 23 ′ E; elev. 1000 m), 1 ♂, 14. XI. 1988, coll. Jian Yao. Distribution. China (Xizang, Taiwan), India. Remark. The species is recorded in the mainland of China for the first time.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFDBCC348CD9F88E76ADFEA3.taxon	materials_examined	Material examined. No additional material examined. Distribution. China (Taiwan).	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFD9CC368CD9FF357462FE46.taxon	materials_examined	Material examined. China, Sichuan, Huili, Yiding (26 º 35 ′ N, 102 º 15 ′ E; elev. 2000 – 2200 m), 1 ♀, 30. VII. 1974, coll. Yinheng Han. Distribution. China (Sichuan), Malaysia. Remark. The species is recorded in China for the first time.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFD8CC368CD9FDCC73D5FA03.taxon	diagnosis	Diagnosis. The species is different from other species of Tetralonioidella by pubescence on mesosomal terga pale gray intermixed with blackish pubescence, T 1 – T 3 with yellowish-brown apical hair bands, and T 4 with white apical hair band. And the pubescent color-pattern on metasomal terga is different from other species of Tetralonioidella. Description. Female. BL 9.8 mm (Fig. 4 a); head broader than long, HW: HL = 66: 45 (Fig. 4 b); gena distinctly narrower than eye, GW: EW = 9: 15; width of metasoma slightly broader than the width between the tegulae, MtW: MsW = 78: 74. Clypeus broader than long (Fig. 4 b); apical margin of labrum obviously concave (Fig. 4 c); antenna long, reaching behind margin of tegula, scape conically broadened, longer than F 1 and F 2 together, flagellomere equal in breadth, F 1 slightly longer than broad, F 2 long than broad, nearly twice as long as broad, F 3 equal in length with F 4, about 1.5 times as long as broad, F 5 – F 9 equal in length, about 1.2 times as long as broad, F 10 rounded apically, equal in length with F 3, about 1.5 times as long as broad (Fig. 4 d); fore wing with distinct numerous papillae apically (Fig. 4 e); scutellar spines slender, tapering sharp apically, barely visible between pubescence; inner ramus of hind tarsal claw claw-like, arolium present (Fig. 4 h). Clypeus black except apical margin yellowish brown (Figs 4 b – c); basal half part of mandible yellowish-brown, apical half part reddish (Fig. 4 c); labrum black except apical 1 / 5 part yellowish brown (Fig. 4 c); antenna dark blackish-brown beneath (Fig. 4 d); tegula yellowish-brown (Fig. 4 f); all legs blackish-brown; hind tarsal claw reddish apically (Fig. 4 h). Scutum pubescence pale gray, intermixed with blackish hairs (Figs 4 a, f); clypeus covered short pale white hairs, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered long pale white hairs (Fig. 4 b); vertex, scutum, scutellum, metanotum covered with pale gray hairs, intermixed with blackish hairs (Figs 4 a, d, f); genal area, episternum covered yellowish-white hairs (Fig. 4 a); T 1 – T 3 with short, light yellowish-brown hair bands before marginal zones, T 4 with white hair band before marginal zone, disc of T 1 – T 3 covered yellowish-brown hairs, intermixed black hairs, disc of T 4 covered black hairs (Fig. 4 g). Male. Unknown. Material examined. Holotype. ♀, China, Yunnan, Xishuangbanna, Damenglong (21 º 34 ′ N, 100 º 41 ′ E; elev. 650 m), 22. IV. 1958, Chunpei Hong. Distribution. China (Yunnan). Etymology. The type location Damenglong (Yunnan, China) is given as the specific name.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFD8CC398CD9FA0073CBFD9B.taxon	diagnosis	Diagnosis. The species is similar to male of T. pendleburyi by its apical margin of labrum almost straight, but different by its unique shape of S 7 and S 8. Description. Male. BL 10.0 mm (Fig. 5 a); head broader than long, HW: HL = 68: 51 (Fig. 5 b); gena distinctly narrower than eye, GW: EW = 12: 18; width of metasoma broader than the width between the tegulae, MtW: MsW = 78: 70. Clypeus slightly broader than long (Fig. 5 b); apical margin of labrum straight (Fig. 5 c); antenna short, reaching front margin of tegula, scape conically broadened, as long as F 1 to F 3 together, flagellomere equal in breadth, F 1 longer than broad, nearly 1.2 times as long as broad, F 2 long than broad, nearly 1.6 times as long as broad, F 3 equal in length with F 4, about 1.2 times as long as broad, F 5 – F 10 equal in length, nearly as long as broad, F 11 rounded apically, equal in length with F 3, about 1.4 times as long as broad (Fig. 5 d); fore wing with distinct numerous papillae apically (Fig. 6 a); scutellar spines short and broad, pointed apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present (Fig. 6 b); ventral surface of apical part of S 7 with dense setae laterally, median part slightly convex, with sparse setae (Fig. 6 c); apical margin of median process of S 8 slightly concave (Fig. 6 d); genitalia as illustrated in Fig. 6 e (in dorsal view) and Fig. 6 f (in lateral view), basal part of gonostylus with blunt triangular process dorsally, and the process with dense long hairs along dorsal margin (Fig. 6 f). Clypeus black (Fig. 5 b); mandible blackish-brown except reddish apically; labrum blackish-brown with two small bright brown spots laterally (Fig. 5 c); antenna dark blackish-brown beneath (Fig. 5 d); tegula yellowish-brown (Fig. 5 e); all legs blackish-brown except mediotarsus and distitarsus dark yellowish-brown; hind tarsal claw blackish-brown apically (Fig. 6 b). Scutum pubescence yellowish-brown (Figs 5 a, e); clypeus, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered with sparse yellowish-brown hairs (Fig. 5 b); vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish-brown hairs (Figs 5 a, d – e); all metasomal terga uniformly covered with thin and short yellowish hairs (Fig. 5 f). Female. Unknown. Material examined. Holotype. ♂, China, Guangdong, Mt. Dinghu (23 º 10 ′ N, 120 º 34 ′ E), 23. V. 1979, coll. Yaoquan Li, Yingshu Xie & Shiyang Xia. Distribution. China (Guangdong). Etymology. The type location Mt. Dinghu (Guangdong, China) is given as the specific name.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFD7CC3B8CD9F80A7334FD61.taxon	diagnosis	Diagnosis. The antennae and S 7 of the new species is very similar to that of T. himalayana, but the pubescent colour- pattern of scutum is different from T. himalayana, apical margin of median process of S 8 distinctly concave, and with distinct median hair fringe. Description. Male. BL 10.5 mm (Fig. 7 a); head broader than long, HW: HL = 72: 56 (Fig. 7 b); gena slightly narrower than eye, GW: EW = 13: 16; width of metasoma slightly broader than the width between the tegulae, MtW: MsW = 90: 87. Clypeus slightly broader than long (Fig. 7 b); apical margin of labrum distinctly concave (Fig. 7 c); antenna long, reaching behind margin of tegula, scape conically broadened, as long as F 2 to F 4 together, flagellomere equal in breadth, F 1 as long as broad, F 2 long than broad, nearly twice times as long as broad, F 3 equal in length with F 4, about 1.6 times as long as broad, F 5 equal in length with F 6, nearly 1.2 times as long as broad, F 7 – F 10 equal in length, nearly as long as broad, F 11 hooked apically in lateral view, equal in length with F 2, about twice times as long as broad (Fig. 7 d); fore wing with distinct numerous papillae apically (Fig. 8 a); scutellar spines slender, long, tapering apically, barely visible between pubescence; inner ramus of hind tarsal claw claw-like, arolium present (Fig. 8 b); ventral surface of apical part of S 7 with dense setae laterally, median part distinctly convex, with thin inconspicuous sparse setae (Fig. 8 c); apical margin of median process of S 8 distinctly concave, with distinct median hair fringe (Fig. 8 d); genitalia as illustrated in Fig. 8 e (in dorsal view) and Fig. 8 f (in lateral view), basal part of gonostylus with complicated processes at dorsal and ventral side, and the processes with dense long hairs (Fig. 8 f). Clypeus black except apical margin yellowish-brown (Fig. 7 b); basal half part of mandible yellowish-brown and apical half part dark reddish (Fig. 7 c); labrum dark yellowish-brown (Fig. 7 c); antenna dark brown beneath (Fig. 7 d); tegula yellowish-brown (Fig. 7 e); all legs dark reddish-brown except mediotarsus and distitarsus dark yellowish-brown; hind tarsal claw dark yellowish-brown apically (Fig. 8 b). Scutum pubescence bicoloured, scutum with narrow, transverse, pale gray pubescent stripe between tegulae (Fig. 7 e); clypeus, periphery of antennal socket, supraclypeal area and front surface of scape covered with dense white hairs (Fig. 7 b); paraocular area, vertex, genal area, and episternum covered with pale gray hairs, scutum, scutellum, metanotum covered with dense and long gray hairs, intermixed blackish hairs (Fig. 7 e); T 1 – T 5 with short, light yellowish-brown hair bands before marginal zones (Figs 7 f, 8 a). Female. Unknown. Material examined. Holotype. ♂, China, Sichuan, Mt. Emei (29 º 30 ′ N, 103 º 18 ′ E; elev. 800 – 1000 m), 20. IV. 1957, Hongfu Zhu. Distribution. China (Sichuan). Etymology. The type location Mt. Emei (Sichuan, China) is given as the specific name.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFD4CC3C8CD9F94F73D4FEA3.taxon	diagnosis	Diagnosis. The new species has the mesosomal terga with yellowish-orange pubescence, similar to T. pendleburyi, but all metasomal terga uniformly covered with thin and short yellowish-brown hairs, intermixed with black hairs. Description. Male. BL 9.0 mm (Fig. 9 a); head broader than long, HW: HL = 63: 47 (Fig. 9 b); gena distinctly narrower than eye, GW: EW = 7: 17; width of metasoma slightly broader than the width between the tegulae, MtW: MsW = 74: 70. Clypeus broader than long (Fig. 9 b); apical margin of labrum nearly straight (Fig. 9 c); antenna short, reaching front margin of tegula, scape conically broadened, as long as F 1 to F 3 together, flagellomere equal in breadth, F 1 longer than broad, nearly 1.8 times as long as broad, F 2 longer than broad, nearly twice as long as broad, F 3 equal in length with F 4, about 1.25 times as long as broad, F 5 – F 10 equal in length, nearly as long as broad, F 11 rounded apically, equal in length with F 2, about twice as long as broad (Fig. 9 d); fore wing with distinct numerous papillae apically (Fig. 10 a); scutellar spines short and broad, rounded apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present (Fig. 10 b); ventral surface of apical part of S 7 with dense setae laterally, median part slightly convex with sparse setae (Fig. 10 c); apical margin of median process of S 8 distinctly concave (Fig. 10 d); genitalia as illustrated in Fig. 10 e (in dorsal view) and Fig. 10 f (in lateral view), basal part of gonostylus with broad blunt triangular process dorsally, and the process with a few long hairs along dorsal margin (Fig. 10 f). Clypeus black (Fig. 9 b); middle part of mandible dark reddish-brown, basal and apical part of mandible blackish; labrum black (Fig. 9 c); antenna dark black beneath (Fig. 9 d); tegula yellowish-brown (Fig. 9 e); all legs dark reddish-brown; hind tarsal claw dark reddish-brown apically (Fig. 10 b). Scutum pubescence yellowish-orange (Figs 9 a, e); clypeus, supraclypeal area and periphery of antennal socket covered with white hairs, paraocular area, vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish-orange hairs (Figs 9 a – b, d – e); all metasomal terga uniformly covered with thin and short yellowish-brown hairs, intermixed with black hairs (Fig. 9 f). Female. Unknown. Material examined. Holotype. ♂, China, Yunnan, Xishuangbanna, Mt. Guomen (101 º 35 ′ E 24 º 52 ′ N), 13. V. 2013, coll. Pia Oremek. Distribution. China (Yunnan). Etymology. The type location Mt. Guomen (Yunnan, China) is given as the specific name.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFD2CC3E8CD9F96273D3FEEE.taxon	diagnosis	Diagnosis. The new species can be distinguished from other species of Tetralonioidella by its unique shape of S 8, its apical margin of median process straight. Description. Male. BL 9.8 mm (Fig. 11 a); head broader than long, HW: HL = 57: 42 (Fig. 11 b); gena distinctly narrower than eye, GW: EW = 9: 18; width of metasoma as broad as the width between the tegulae, MtW: MsW = 66: 66. Clypeus broader than long (Fig. 11 b); apical margin of labrum slightly concave (Fig. 11 c); antenna short, reaching front margin of tegula, scape conically broadened, as long as F 1 to F 3 together, flagellomere equal in breadth, F 1 longer than broad, nearly 1.25 times as long as broad, F 2 long than broad, nearly 1.8 times as long as broad, F 3 equal in length with F 4, about 1.25 times as long as broad, F 5 - F 10 equal in length, nearly as long as broad, F 11 rounded apically, equal in length with F 2, about 1.8 times as long as broad (Fig. 11 d); fore wing with distinct numerous papillae apically (Fig. 12 a); scutellar spines slender, tapering sharp apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present (Fig. 12 b); ventral surface of apical part of S 7 with dense setae laterally, median part slightly convex, nearly bare (Fig. 12 c); apical margin of median process of S 8 straight (Fig. 12 d); genitalia as illustrated in Fig. 12 e (in dorsal view) and Fig. 12 f (in lateral view), basal part of gonostylus with crescent-shaped process dorsally, and the process with a few long hairs along dorsal margin, another slender belt-shaped projection with a few long hairs at its apex presented outside (Fig. 12 f). Clypeus black (Fig. 11 b); mandible dark reddish-brown; labrum dark yellowish-brown (Fig. 11 c); antenna dark yellowish-brown beneath (Fig. 11 d); tegula yellowish-brown (Fig. 11 e); all legs dark reddish-brown except mediotarsus and distitarsus dark yellowishbrown; hind tarsal claw blackish-brown apically (Fig. 12 b). Scutum pubescence yellowish (Figs 11 a, e); clypeus, supraclypeal area covered with white hairs, periphery of antennal socket, paraocular area and front surface of scape covered with yellowish-white hairs (Fig. 11 b); vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish hairs (Figs 11 a, d – e); all metasomal terga uniformly covered with thin and short yellowish-brown hairs, T 2 - T 5 with obscure apical hair bands (Fig. 11 f). Female. Unknown. Material examined. Holotype. ♂, China, Guizhou, Leishan, Mt. Leigong (26 º 24 ′ N, 108 º 13 ′ E; elev. 1000 m), 3. VII. 1988, coll. Longlong Yang. Distribution. China (Guizhou). Etymology. The type location Mt. Leigong (Guizhou, China) is given as the specific name.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFD0CC228CD9F8DD7330FE81.taxon	diagnosis	Diagnosis. The new species is very similar to T. fukienensis, but both sexes apical margin of labrum convex medially. Description. Male. BL 9.2 mm (Fig. 13 a); head broader than long, HW: HL = 62: 45 (Fig. 13 b); gena distinctly narrower than eye, GW: EW = 10: 16; width of metasoma slightly broader than the width between the tegulae, MtW: MsW = 72: 70. Clypeus broader than long (Fig. 13 b); apical margin of labrum convex medially (Fig. 13 c); antenna short, reaching front margin of tegula, scape conically broadened, as long as F 1 to F 3 together, flagellomere equal in breadth, F 1 longer than broad, nearly 1.2 times as long as broad, F 2 long than broad, nearly 1.4 times as long as broad, F 3 equal in length with F 1, about 1.2 times as long as broad, F 4 – F 10 equal in length, nearly as long as broad, F 11 rounded apically, equal in length with F 2, about 1.4 times as long as broad (Fig. 13 d); fore wing with distinct numerous papillae apically (Fig. 14 a); scutellar spines slender, tapering sharp apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present (Fig. 14 b); ventral surface of apical part of S 7 with dense setae laterally, median part straight, with sparse setae (Fig. 14 c); apical margin of median process of S 8 slightly concave (Fig. 14 d); genitalia as illustrated in Fig. 14 e (in dorsal view) and Fig. 14 f (in lateral view), basal part of gonostylus with blunt triangular process dorsally, and the process with dense long hairs along dorsal margin, another slender belt-shaped projection with long hairs at its apex presented outside (Fig. 14 f). Clypeus black (Fig. 13 b); mandible dark reddish-brown; labrum blackish-brown (Fig. 13 c); antenna dark blackish-brown beneath (Fig. 13 d); tegula yellowish-brown (Fig. 13 e); all legs dark reddish-brown; hind tarsal claw blackish-brown apically (Fig. 14 b). Scutum pubescence yellowish (Figs 5 a, e); clypeus, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered with sparse yellowish-white hairs (Fig. 13 b); vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish hairs (Figs 13 a – b, e); all metasomal terga uniformly covered with thin and short yellowish hairs (Fig. 13 f). Female. BL 10.4 mm (Fig. 15 a); head broader than long, HW: HL = 62: 46 (Fig. 15 b); gena distinctly narrower than eye, GW: EW = 10: 20; width of metasoma slightly broader than the width between the tegulae, MtW: MsW = 85: 78. Clypeus broader than long (Fig. 15 b); apical margin of labrum convex medially (Fig. 15 c); antenna short, reaching front margin of tegula, scape conically broadened, as long as F 1 and F 2 together, flagellomere equal in breadth, F 1 slightly longer than broad, nearly 1.2 times as long as broad, F 2 long than broad, nearly 1.6 times as long as broad, F 3 longer than broad, nearly 1.4 times as long as broad, F 4 – F 9 equal in length, about 1.2 times as long as broad, F 10 rounded apically, equal in length with F 3, about 1.4 times as long as broad (Fig. 15 d); fore wing with distinct numerous papillae apically (Fig. 15 e); scutellar spines slender, tapering sharp apically, barely visible between pubescence; inner ramus of hind tarsal claw claw-like, arolium present (Fig. 15 h). Clypeus black (Fig. 15 b); labrum black (Fig. 15 c); antenna dark blackish-brown beneath (Fig. 15 d); tegula yellowish-brown (Fig. 15 f); all legs dark reddish-brown except mediotarsus and distitarsus dark yellowish-brown. Scutum pubescence yellowish-brown (Figs 15 a, f); clypeus covered short pale white hairs, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered long yellowish- white hairs (Fig. 15 b); vertex, scutum, scutellum, metanotum covered with yellowish-brown hairs (Figs 15 a, d, f); dorsal half part of genal area covered with yellowish-brown hairs, ventral half part covert yellowish-white hairs, episternum covered yellowish-brown hairs (Fig. 4 a); all metasomal terga uniformly covered with short, yellowish-brown hairs (Fig. 15 g). Material examined. Holotype. ♂, China, Fujian, Mt. Longqi (26 º 44 ′ N, 117 º 24 ′ E; elev. 850 m), 26. VI. 1991, coll. Xingjian Wang. Paratype. 1 ♀, same locality as holotype, 25. VI. 1991, coll. Longlong Yang. Distribution. China (Fujian). Etymology. The type location Mt. Longqi (Fujian, China) is given as the specific name.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFCCCC248CD9FE8273EAFECB.taxon	diagnosis	Diagnosis. Apical margin of labrum slightly concave, similar to male of T. fukienensis and T. insidiosa, but they can be distinguished by the different S 7, S 8 and genitalia. Description. Male. BL = 10.1 mm (Fig. 16 a); head broader than long, HW: HL = 64: 47 (Fig. 16 b); gena distinctly narrower than eye, GW: EW = 9: 19; width of metasoma slightly broader than the width between the tegulae, MtW: MsW = 76: 74. Clypeus broader than long (Fig. 16 b); apical margin of labrum slightly concave (Fig. 16 c); antenna short, reaching front margin of tegula, scape conically broadened, longer than F 1 to F 3 together, flagellomere equal in breadth, F 1 longer than broad, nearly 1.2 times as long as broad, F 2 long than broad, nearly 1.5 times as long as broad, F 3 longer than broad, nearly 1.2 times as long as broad, F 4, F 5, F 6 and F 10 equal in length about 1.1 times as long as broad, F 7 – F 9 equal in length, nearly as long as broad, F 11 rounded apically, equal in length with F 2, about 1.5 times as long as broad (Fig. 16 d); fore wing with distinct numerous papillae apically (Fig. 17 a); scutellar spines short and broad, blunt rounded apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present (Fig. 16 b); ventral surface of apical part of S 7 with dense setae laterally, median part slightly concave, with sparse setae (Fig. 17 c); apical margin of median process of S 8 distinctly concave (Fig. 17 d); genitalia as illustrated in Fig. 17 e (in dorsal view) and Fig. 17 f (in lateral view), basal part of gonostylus with crescent-shaped process dorsally, and the process with dense long hairs along dorsal margin (Fig. 17 f). Clypeus black (Fig. 16 b); mandible reddish-brown; labrum dark yellowish-brown except apical margin black (Fig. 16 c); antenna black beneath (Fig. 16 d); tegula yellowish-brown (Fig. 16 e); all legs dark reddish-brown; hind tarsal claw black apically (Fig. 17 b). Scutum pubescence yellowish (Figs 16 a, e); clypeus covered with white hairs, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered with yellowish-white hairs (Fig. 16 b); vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish hairs (Figs 16 a, e); T 1 covered with thin and short yellowish-brown hairs (Fig. 16 f), T 2 - T 4 with short, yellowish-white hair bands before marginal zones, and the bands gradually narrowed medially; disc of T 2 – T 4 covered dark yellowish-brown hairs (Figs 16 a, f, 17 a). Female. Unknown. Material examined. Holotype. ♂, China, Xizang, Mêdog, Maniweng (28 º 44 ′ N, 95 º 01 ′ E; elev. 1050 m), 31. VI. 1979, coll. Gentao Jin & Jianyi Wu. Distribution. China (Xizang). Etymology. The type location Maniweng (Mêdog, Xizang, China) is given as the specific name.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFCACC268CD9FE7973D7FE29.taxon	diagnosis	Diagnosis. The new species can be distinguished from other species of Tetralonioidella by its unique shape of S 8, apical margin of median process of S 8 concave, and with a projection medially. Description. Male, BL 9.5 mm (Fig. 18 a); head broader than long, HW: HL = 66: 50 (Fig. 18 b); gena distinctly narrower than eye, GW: EW = 8: 16; width of metasoma slightly broader than the width between the tegulae, MtW: MsW = 82: 78. Clypeus broader than long (Fig. 18 b); apical margin of labrum slightly concave (Fig. 18 c); antenna short, reaching front margin of tegulae; scape conically broadened, as long as F 1 to F 3 together, flagellomere equal in breadth, F 1 longer than broad, nearly 1.2 times as long as broad, F 2 long than broad, nearly 1.4 times as long as broad, F 3 equal in length with F 1, about 1.2 times as long as broad, F 4 – F 10 equal in length, nearly as long as broad, F 11 rounded apically, equal in length with F 2, about 1.4 times as long as broad (Fig. 18 d); fore wing with distinct numerous papillae apically (Fig. 19 a); scutellar spines short and broad, pointed apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present (Fig. 19 b); ventral surface of apical part of S 7 with dense setae laterally, median part straight, with sparse setae (Fig. 19 c); apical margin of median process of S 8 slightly concave, with a projection medially (Fig. 19 d); genitalia as illustrated in Fig. 19 e (in dorsal view) and Fig. 19 f (in lateral view), basal part of gonostylus with crescent-shaped process dorsally, and the process with dense long hairs along dorsal margin (Fig. 19 f). Clypeus black (Fig. 18 b); mandible dark reddish-brown; labrum blackish-brown except apical part yellowish-brown (Fig. 18 c); antenna dark blackish-brown beneath (Fig. 18 d); tegula yellowish-brown (Fig. 18 e); all legs dark reddish-brown; hind tarsal claw blackish-brown apically (Fig. 19 b). Scutum pubescence yellowish-white (Figs 18 a, e); clypeus, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered with sparse white hairs (Fig. 18 b); vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish-white hairs (Figs 18 a – b, e); all metasomal terga uniformly covered with thin and short yellowish hairs, and the hairs on T 3 - T 5 denser than that on T 1 – T 2 (Fig. 18 f). Female. Unknown. Material examined. Holotype. ♂, China, Zhejiang, Mt. Tianmu (30 º 24 ′ N, 119 º 30 ′ E), 2. IX. 1947. Paratype. 1 ♂, same data as holotype. Distribution. China (Zhejiang). Etymology. The type location Mt. Tianmu (Zhejiang, China) is given as the specific name.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFC8CC2B8CD9FE1A745DF9B2.taxon	diagnosis	Diagnosis. The new species has fore wing without papillae, just as that of T. heinzi, but the bristle-like setae on ventral surface S 7 of male are denser than that of T. heinzi, pubescence on scutum and metasoma sparser than that of T. heinizi, yellowish-brown, not fox-red. Description. Male. BL 9.0 – 10.2 mm (holotype 10.0 mm) (Fig. 20 a); head broader than long, HW: HL = 60: 43 (Fig. 20 b); gena distinctly narrower than eye, GW: EW = 10: 15; width of metasoma slightly narrower than the width between the tegulae, MtW: MsW = 70: 72. Clypeus broader than long (Fig. 20 b); apical margin of labrum distinctly concave (Fig. 20 c); antenna long, reaching behind margin of tegula, scape conically broadened, slightly shorter than F 1 to F 3 together, flagellomere equal in breadth, F 1 as long as broad, F 2 - F 4 equal in length and long than broad, nearly 1.4 times as long as broad, F 5 - F 10 equal in length, nearly 1.2 times as long as broad, F 11 rounded apically, equal in length with F 2, about 1.4 times as long as broad (Fig. 20 d); fore wing with numerous minute hairs apically, distinct papillae absent (Fig. 21 a); scutellar spines broad and short, rounded apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present (Fig. 21 b); apical part of S 7 triangular, with small incision at apex, ventral surface of apical part of S 7 with stiff, short to long dense setae laterally (Fig. 21 c); apical margin of median process of S 8 distinctly concave (Fig. 21 d); genitalia as illustrated in Fig. 21 e (in dorsal view) and Fig. 21 f (in lateral view), basal part of gonostylus with broad rectangular process dorsally, and the process with dense long hairs along dorsal and apical margin, penis valve without rectangular processes laterally (Fig. 21 f). Clypeus black (Fig. 20 b); basal part of mandible black, middle part of mandible dark blackish-brown, apical part of mandible dark reddish-brown; labrum black (Fig. 20 c); antenna dark blackish-brown beneath (Fig. 20 d); tegula yellowish-brown (Fig. 20 e); all legs dark reddish-brown except mediotarsus and distitarsus dark yellowish-brown; hind tarsal claw blackish-brown apically (Fig. 21 b). Scutum pubescence yellowish-brown (Figs 20 a, e); clypeus, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered with sparse yellowish-white hairs (Fig. 20 b); vertex, genal area, scutum, scutellum, metanotum and episternum covered with dense and long yellowish-brown hairs (Figs 20 a, d – e); all metasomal terga uniformly covered with thin and short yellowish hairs, and T 2 - T 4 with yellowish-white hair bands before marginal zones (Fig. 20 f). Female. BL 11.2 mm (Fig. 22 a); head broader than long, HW: HL = 71: 50 (Fig. 22 b); gena distinctly narrower than eye, GW: EW = 11: 20; width of metasoma broader than the width between the tegulae, MtW: MsW = 87: 80. Clypeus broader than long (Fig. 22 b); apical margin of labrum straight (Fig. 20 c); antenna long, reaching behind margin of tegula, scape conically broadened, slightly shorter than T 1 to F 3 together, flagellomere equal in breadth, F 1 slightly longer than broad, nearly 1.2 times as long as broad, F 2 long than broad, nearly 1.6 times as long as broad, F 3 equal in length with F 4, longer than broad, nearly 1.4 times as long as broad, F 5 – F 9 equal in length, about 1.2 times as long as broad, F 10 rounded apically, equal in length with F 2, about 1.6 times as long as broad (Fig. 22 d); fore wing with numerous minute hairs apically, distinct papillae absent (Fig. 22 e); scutellar spines short and broad, rounded apically, barely visible between pubescence; inner ramus of hind tarsal claw axe-shaped, arolium present (Fig. 22 h). Clypeus black (Fig. 22 b); labrum blackish-brown (Fig. 22 c); antenna dark black beneath (Fig. 22 d); tegula yellowish-brown (Fig. 22 f); all legs dark reddish-brown except mediotarsus and distitarsus dark yellowish-brown. Scutum pubescence yellowish-brown (Figs 22 a, f); clypeus covered short and sparse yellowish-white hairs, periphery of antennal socket, supraclypeal area, paraocular area and front surface of scape covered long yellowish-white hairs (Fig. 22 b); vertex, scutum, scutellum, metanotum covered with yellowish-brown hairs (Figs 22 a, f); all metasomal terga uniformly covered with short, yellowish-brown hairs (Fig. 22 g). Material examined. Holotype. ♂, China, Sichuan, Yibin, Mt. Fuxian (28 º 42 ′ N, 104 º 38 ′ E; elev. 400 – 500 m), 31. V. 2016, Feng Yuan. Paratypes. 7 ♂, same data as holotype; 2 ♂, Hubei, Lichuan, Mt. Xingdou (30 º 02 ′ N, 109 º 08 ′ E; elev. 850 – 900 m), 21 – 25. VII. 1989, coll. Shuyong Wang & Longlong Yang; 1 ♂, Hubei, Hefeng, Fengshuifeng (29 º 55 ′ N, 110 º 12 ′ E; elev. 1100 m), 29. VII. 1989, coll. Shuyong Wang; 1 ♂, Hunan, Guzhang, Gaowangjie (28 º 40 ′ N, 110 º 05 ′ E; elev. 460 – 600 m), 31. VII. 1988, coll. Shuyong Wang; 2 ♂ 3 ♀, Hunan, Dayong, Zhushitou (29 º 19 ′ N, 110 º 12 ′ E; elev. 350 – 600 m), 19 – 21. VIII. 1988, coll. Longlong Yang; 1 ♂, Hunan, Shuishun, Forest Farm of Shanmuhe (29 º 08 ′ N, 109 º 50 ′ E; elev. 650 m), 5. VIII. 1988, coll. Longlong Yang; 1 ♂, Sichuan, Wan Xian, Wang’erbao (32 º 43 ′ N, 105 º 25 ′ E; elev. 1300 m), 15. VII. 1993, coll. Shimei Song; 1 ♂, Guizhou, Shiqian, Jinxing (27 º 30 ′ N, 108 º 08 ′ E; elev. 600 m), 21. VII. 1988, coll. Longlong Yang; 1 ♂, Hainan, Qiongzhong, Limushan, Binlang Lake (19 º 11 ′ N, 109 º 47 ′ E; elev. 562 m), 7. IV. 2010, coll. Kuiyan Zhang. Distribution. China (Hunan, Hubei, Sichuan, Guizhou, Hainan). Etymology. The specific name is dedicated to Prof. Yanru Wu of Institute of Zoology, Chinese Academy of Sciences for her contributions to bee taxonomy. Funding This work was supported mainly by the National Specific Research Funds for Public Benefit Department (Agriculture) (201303108) to Zeqing Niu, the National Science Fund for Distinguished Young Scholars (31625024) to Chaodong Zhu, partially by the NSFC Program J 1211002 and the grant (Y 229 YX 5105) from Key Laboratory of Zoological Systematics and Evolution, Chinese Academy of Sciences.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
03C38791FFC8CC2B8CD9FE1A745DF9B2.taxon	description	Acknowledgements The authors sincerely thank Prof. Yanru Wu, Dr. Yanzhou Zhang (Institute of Zoology, Chinese Academy of Sciences, Beijing, China) and anonymous reviewers for their comments and suggestions on earlier drafts of the manuscript, and are grateful to Dr. Douglas Chesters (Institute of Zoology, Chinese Academy of Sciences, Beijing, China) for revising the English language in parts of the manuscript.	en	Niu, Zeqing, Yuan, Feng, Zhu, Chaodong (2017): Taxonomic study of the genus Tetralonioidella Strand from China (Hymenoptera: Apidae: Melectini). Zoological Systematics 42 (4): 418-445, DOI: 10.11865/zs.201718
