Psen brinchangensis van Lith, 1965

Deng, Yao, Ma, Li & Li, Qiang, 2025, Taxonomic update of Psen Latreille, 1796 (Hymenoptera, Crabronidae), with descriptions of three new species from China, Journal of Hymenoptera Research 98, pp. 971-1003 : 971-1003

4. Psen brinchangensis van Lith, 1965

Figs 7 A – J , 8 A – M

Specimens examined.

China • 1 ♀; Yunnan Province, Xishuangbanna Autonomous Prefecture, Menghai County, Blangshan Township ; 21°4'4.8"N, 100°26'37.62"E; 1677 m a. s. l.; 13.VIII–15.IX2020; NO. 202101554 ; malaise trap . China • 1 ♀; Yunnan Province, Xishuangbanna Autonomous Prefecture, Menghai County, Blangshan Township ; 21°45'4.8"N, 100°26'37.62"E; 1677 m a. s. l.; 16.VII–16.VIII.2021; NO. 202105343 ; malaise trap . China • 1 ♀; Yunnan Province, Xishuangbanna Autonomous Prefecture, Menghai County, Blangshan Township ; 21°44'29.88"N, 100°26'53.34"E; 1659 m a. s. l.; 21.VIII–20.IX.2019; NO. 2019010395 ; malaise trap . China • 1 ♀; Yunnan Province, Xishuangbanna Autonomous Prefecture, Menghai County, Guanggang village ; 21°49'49.9"N, 100°28'20.04"E; 1229 m a. s. l.; 15.IX–23.X.2020; NO. 202102250 ; malaise trap . China • 1 ♀; Yunnan Province, Xishuangbanna Autonomous Prefecture, Menghai County, Blangshan Township ; 21°45'4.8"N, 100°26'37.62"E; 1677 m a. s. l.; 15.IX–15.X.2021; NO. 202105550 ; malaise trap . China • 1 ♂; Yunnan Province, Xishuangbanna Autonomous Prefecture, Menghai County, Blangshan Township ; 21°44'31.26"N, 100°26'38.9"E, 1646 m a. s. l.; 20.VII–16.VIII.2018; NO. 2019000409 ; malaise trap . China • 1 ♂; Yunnan Province, Xishuangbanna Autonomous Prefecture, Menghai County, Blangshan Township ; 21°44'31.26"N, 100°26'38.9"E, 1646 m a. s. l., 19.IV–28.V.2019; NO. 2019005958 ; malaise trap . China • 5 ♂♂; Yunnan Province, Xishuangbanna Autonomous Prefecture, Menghai County, Blangshan Township ; 21°44'31.26"N, 100°26'38.9"E; 1646 m a. s. l.; 12.VIII–15.IX.2020; NO. 202100968 - 202100969 , NO. 202100980 - 202100981 , NO. 202102116 ; malaise trap . All types deposited in YNAU.

Description.

Male (first description). Body length 8.1–8.2 mm. Mandible basally, trochanters, inner surface of fore and mid femora and tarsi, most of hind femora, gastral terga I – II and sternum II reddish brown or yellowish brown. Antennae flagellomeres beneath, outer surface of fore and mid femora and mid tibiae, hind tibiae and tarsi yellowish brown. Gastral sterna III – VI dark brown. Appressed setae on clypeus silvery; frons, vertex, scutum, scutellum and metanotum with appressed pale yellow pubescence and long erect setae. Mid-length setae on mesopleuron, mesosternum, propodeum, ventral side of petiole, and legs silvery. Gastral sterna III and IV with gold fasciculate setae on hind margins. Posterior margins of gastral terga I – V with dense, long, gold erect setae. (Fig. 8 A, B )

Head. Clypeus with dense, fine punctures, clypeal middle lobe with shallow, arcuate emargination, side with two obtuse teeth, basal half of clypeal disk moderately convex (Fig. 8 C ). HW: HLF: AOD: WAS: IAD = 72: 56: 5: 7: 11. Mandible bidentate apically, width basally: medially: apically = 9: 5: 2. Interantennal tooth moderately elevated, apex acute; frontal carina conspicuous, extending from median ocellus to apex of interantennal tooth (Fig. 8 C ). Scape slightly bent, pedicel partially concealed within scape, antennal articles V – XIII beneath with elliptical excavation, articles V and XIII smaller, and remaining articles larger; relative lengths of articles III – XIII = 15, 10, 10, 11, 11, 11, 10, 10, 10, 10, 15; article III approximately 2.5 × as long as wide apically, article IV about 1.7 ×, article XII about 1.3 ×, respectively (Fig. 8 D ). Frons shiny, with sparse, tiny punctures (Fig. 8 C ). Interocellar area and vertex shiny, with sparse, tiny punctures; ocellar area not raised, behind postocelli without sulcus, vertex behind postocelli not raised, occipital carina inconspicuous, crenulate (Fig. 8 E ). HW: HLD: POD: OOD: OCD = 72: 31: 11: 12: 15.

Thorax. Scutum with sparse, tiny to fine punctures, interspaces 2–4 × puncture diameter. Admedian lines, parapsidal lines and notauli nearly parallel (Fig. 8 F ). Scutellum and metanotum with sparse, fine punctures (Fig. 8 G ). Mesopleuron shiny, with sparse, tiny punctures, posterior margin of mesopleuron with sparse, short striae. Metapleura shining, without stria or puncture (Fig. 8 H ). Mesosternum without acetabular carina, longitudinal medioventral carina conspicuous, medially with many transverse carinae. Propodeal enclosure broadly triangular, its marginal ridge conspicuous posteriorly, gradually weakening anterolaterally, inner area slightly depressed, shining, laterally with some inconspicuous longitudinal carinae; propodeal pad with sparse, inconspicuous, irregular rugae (Fig. 8 G ). Posterior surface of propodeum with irregular reticulate ridges reaching propodeal enclosure (Fig. 8 I ). In profile, dorsal surface of propodeum together with posterior of surface nearly arcuate, dorsolaterally surface of propodeum with oblique, short rugae and fine punctures (Fig. 8 H ). Second recurrent vein received by third submarginal cell basally (Fig. 8 B ). Hind tibia with five or six short, thick, yellowish brown spines on outer surface.

Gaster. PL: PW: LT I: WT I: HFL: HTL = 57: 8: 44: 46: 47: 50. Petiole cylindrical in cross section, slightly bent upwards basally, slightly widened backwards, width apically 1.8 × basally, dorsally smooth (Fig. 8 A ). Lateral surface without carina and depression, with sparse, tiny punctures (Fig. 8 B ). Gaster shiny, with sparse, tiny to fine punctures, base of terga II – IV smooth, impunctate (Fig. 8 B ). Genitalia large, yellowish-brown, gonostyle slender and long, inner (or dorsal) margin with narrow translucent membrane apically, outer (or ventral) and inner (or dorsal) margin with sparse, long setae (Fig. 8 J – M ). Volsellar digitus flattened, hollowed ventrally, with apex round and turned ventrally, inner area slightly produced apically (Fig. 8 J – M ).

Female supplement characteristics.

In front view, HW: HLF: AOD: WAS: IAD = 84: 65: 5: 7: 11; antennae relative lengths of articles III – XII = 19–20, 12–14, 12–13, 12–13, 11–12, 12, 11, 10–11, 10–11, 15–16; article III approximately 2.8 × as long as wide apically, article IV about 1.7–2 ×, article XII about 2.1–2.3 ×, respectively. In dorsal view, HW: HLD: POD: OOD: OCD = 84: 35: 10: 12: 15. Mesosternum with inconspicuous longitudinal medioventral carina; medially with two or three transverse carinae. PL: PW: LT I: WT I: HFL: HTL = 60: 9: 48: 54: 56: 65.

Distribution.

China ( Yunnan); Malaysia. First record from China.

In China, 32 species and six subspecies have been documented, we have made a distribution map of Psen species in China (Fig. 9 ).

Figures

Figure 7. Psen brinchangensis van Lith, 1965. Female. A. Habitus, dorsal view; B. Habitus, lateral view; C. Head, frontal view; D. Antennae; E. Head, pronotum and scutum, dorsal view; F. Scutellum and metanotum, dorsal view; G. Propodeum, dorsal view; H. Thorax, lateral view; I. Propodeum, posterior view; J. Pygidial plate, dorsal view. Scale bar: 1 mm.

Figure 8. Psen brinchangensis van Lith, 1965. Male. A. Habitus, dorsal view; B. Habitus, lateral view; C. Head, frontal view; D. Antennae; E. Head, pronotum and scutum, dorsal view; F. Scutum and scutellum, dorsal view; G. Scutellum, metanotum and propodeum, dorsal view; H. Thorax, lateral view; I. Propodeum, posterior view; J. Male genitalia, dorsal view; K. Male genitalia, ventral view; L, M. Male genitalia, lateral view. Scale bar: 1 mm.

Figure 9. Distribution of Psen from China (the species abbreviation in the map representing the following species: aff = affinis, affa = affinis atayal, ali = alishanus, amb = amboinensis, ass = assamensis, ate = ater, aur = aurifrons, beta = betton attenuatus, bnu = bnun, bri = brinchangensis, fro = fronistriatus, fov = foveicornis, fus = fuscinervis, korf = koreanus formosensis, kul = kulingensis, lac = lacuniventris, lie = lieftincki, lien = lieftincki nigripennis, nit = nitidus, nitt = nitidus takasago, opa = opacus, rubl = rubicundus lawuensis, ruf = rufoannulatus, sau = sauteri, sca = scabrosus, scs = scabristriatus, sem = seminitidus, ser = seriatispinosus, shi = shirozui, shu = shukuzanus, sim = simlensis, spi = spinitibialis, spt = spinitarsalis, tan = tanoi, ter = terayamai, uss = ussuriensis, yun = yunnanensis, rht = rhyssothoracicus).