Trypoxylon flavimaculatum Fu & Li, 2024

Fu, Yan, Li, Qiang & Ma, Li, 2024, Two new species of Trypoxylon Latreille, 1796 from China (Hymenoptera: Crabronidae), Zoological Systematics 49 (4), pp. 309-319 : 310-312

Trypoxylon flavimaculatum Fu & Li , sp. nov. (Fig. 1)

Diagnosis. The new species shares similarities with T. bifoveatum by the laminar dilation of dorsal area of propodeum and apex of metasomal terga II–III each with a fovea medially, but differs from the latter by following characters: supraantennal tubercle at anterior area transversely edged; in fore wing, R1 longer than TCV; legs mostly pale yellow (all trochanters yellowish); metasomal sterna II–IV with yellowish spotted bands; male flagellomeres IV–VIII with linear tyloids ventrally (vs. supraantennal tubercle at anterior area roundly curved; R1 less than or equal to TCV; legs mostly dark brown (all trochanters black); metasoma dark brown; male flagellomeres II–VI with linear tyloids, flagellomeres VII–VIII Figure 1. Trypoxylon flavimaculatum Fu & Li , sp. nov., female (A, C, F–G, J, L) and male (B, D–E, H–I, K, M–Q). A–B. Habitus, lateral view; C–D. Head, frontal view; E. Male antenna, lateral view; F, H. Pronotal collar and mesoscutum, dorsal view; G, I. Propodeum, dorsal view; J–K. Metasomal terga I–III, dorsal view; L–M. Mesosoma, lateral view; N. Male sternum VIII; O–Q. Male genitalia, ventral, dorsal and lateral view. Scale bar = 0.5 mm.

beneath excavated at base and flagellomere VIII produced apically).

Description. Female. Body length 7.7–8.0 mm. Labial palpi, maxillary palpi, mandible mostly, anterior margin of clypeus, pronotal lobe largely, tegula posteriorly, fore leg except base of coxa, mid leg except base of coxa and tarsus, apex of hind coxa, hind trochanter, metasomal sternum II apically, sternum III and base of sternum IV pale yellow; posterior margin of pronotal collar translucent; wings hyaline, veins and pterostigma brown. Body covered with short and silvery setae, length shorter than Od, seta on clypeus, lower frons and gena dense and appressed.

Head (Fig. 1C). Head quadrate in frontal view, HW: HL = 10: 9. Mandible simple. Clypeus nearly flat, with fine, dense punctures; lateral margin of clypeus slightly concave; free margin of clypeus with two small and blunt teeth medially, near tooth with one arcuate prominence on each side. Supraclypeal area narrow, long, length longer than its maximum apical width; supraantennal tubercle low, quadrate, transversely edged at anterior area, without median carina; supraantennal furrow lacking, F I = AW × 3.7, F I: F II: F III = 11: 8: 6. Frons microscopically coriaceous, with fine, dense punctures (PIS ≈ PD), frontal furrow extending as deeply impressed line almost to tip of supraantennal tubercle. Inner eye orbits strongly convergent below, eye incision moderately broad and rather shallow (IODs = 10: 3). Vertex slightly convex, ocellar triangle flattened (OOD: Od: POD = 1: 6: 5). Gena narrow, evenly convex.

Mesosoma (Figs 1F–G, L). Pronotal collar narrow medially and enlarged towards sides, with minute tubercle in middle, anterior margin of collar forms an obtuse triangle (Fig. 1F); pronotal lobes rounded. Mesoscutum, scutellum and metanotum microscopically coriaceous, with fine, dense punctures (PIS ≈ PD). Mesopleuron microscopically coriaceous, without puncture. Metapleuron shiny, without puncture. Dorsal area of propodeum enclosed with shallow U-shaped groove, basally shiny, without oblique rugae, with broad and deep mid furrow, long and transverse rugae within furrow, sides of groove shiny, without puncture (Fig. 1G). Posterior part of propodeum with deep mid groove. Propodeal lateral carina well-developed; propodeal side smooth, without rugae or puncture (Fig. 1L).

Wings. In fore wing, R1 long, almost reaching apex of wing, R1 = TCV × 1.5, CV1 = CV2× 3.5, TCV: CV2 = 6: 5, TCV straight.

Metasoma (Fig. 1J). Metasomal petiole flask-shaped, about 6.2 × as long as posterior width in dorsal, but shorter than metasomal terga II–III combined, P: Ma: 2(Ma): 3(Ma) = 53: 9: 30: 26, apex of metasomal terga II–III each with fovea medially.

Male (Figs 1B–E, H–I, K, M–Q). Body length 7.1–8.5 mm, similar to female externally, except following: metasomal sterna II–III and base of sternum IV mostly dark brown; clypeus less produced anteriorly, free margin with short tooth in middle (Fig. 1D); flagellomeres IV–VIII beneath with linear tyloids, apex of last flagellomere blunt, not curved (Fig. 1E); inner eye orbits notched more broadly and shallowly than female. Measurements: HW: HL = 10: 8.3; F I = AW × 2.7, F I: F II: F III = 8: 7: 7; F XI = BW × 2.1, F IX–X ＜ F XI ＜ F VIII–X; IODs = 10: 4, OOD: Od: POD = 2: 6: 5; R1 = TCV × 1.2, CV1 = CV2 × 3.0, TCV = CV2, TCV straight; P: Ma: 2(Ma): 3(Ma) = 35: 6: 19: 17; sternum 8 (Fig. 1N); genitalia (Figs 1O–Q).

Material examined. Holotype ♀, China, Guizhou Province, Zunyi City, Xishui County, Changjidou Village, 28°24′00″N, 106°11′12″E, 1055 m, 29.IX.2000, coll. Yun Ma ( ZJU). Paratypes. 1♀, China, Fujian Province, Nanping City, Wuyishan City, Guadunshan , 27°44′38″N, 117°38′58″E, 1603 m , 24.VIII.2007, coll. Jingxian Liu ( ZJU); 1♀, China, Zhejiang Province, Quzhou City, Kaihua County, Gutian Mountain National Nature Reserve , 29°15′20″N, 118°09′18″E, 745 m , 2.VII.2005, coll. Ming Shi ( ZJU); 1♀, China, Guangxi Zhuang Autonomous Region, Guilin City , Longsheng Autonomous County, Huaping National Nature Reserve , 25°37′47″N, 109°54′47″E, 725 m , 25.VI .1982 , coll. Junhua He (ZJU); 3♂, China, Guangdong Province, Qingyuan City, Nanling National Nature Reserve , 24°45'29"N, 112°52'03"E, 429 m, 21–25.Ⅰ Ⅴ.2011 (1♂), 1– 6.Ⅴ.2014 (1♂), 25.VI .2016 (1♂), coll. Jingxian Liu (ZJU).

Distribution. China (Fujian, Guangdong, Guangxi, Guizhou, Zhejiang).

Etymology. The specific name is derived from two Latin words: flav - (= yellow) and -maculatum (= macula), referring to the sterna II–IV with yellowish spotted bands.