Psen spinitarsalis Deng & Ma, 2025

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

2. Psen spinitarsalis Deng & Ma sp. nov.

Figs 3 A – J , 4 A – M

Type material.

Holotype. China • ♀; Hunan Province, Chenzhou City, Yizhang County, Mangshan Forest Park ; 24°57'20.02"N, 112°51'7.49"E; 629 m a. s. l.; 01.X.2004; NO. 202005144 ; sweep net . Paratypes. 1 ♀, same data as holotype, except NO. 202004461 ; China • 1 ♀; Guangdong Province, Shaoguan City, Nanling Nature Reserve ; 24°42'52.57"N, 114°15'46.78"E; 447 m a. s. l.; 08–17.VIII.2010; NO. 202003658 ; malaise trap . China • 6 ♂♂; Guangdong Province, Shaoguan City, Nanling Nature Reserve ; 24°42'52.57"N, 114°15'46.78"E; 447 m a. s. l.; 05–07.VI.2010; NO. 202004593 -202004597, NO. 202004593 ; coll. Zaifu XU; malaise trap . China • 1 ♂; Guangdong Province, Shaoguan City, Nanling Nature Reserve ; 24°42'52.57"N, 114°15'46.78"E; 447 m a. s. l.; 17.VII.2008; NO. 202004825 ; coll. Zaifu XU; sweep net . China • 1 ♂; Guangdong Province, Shaoguan City, Nanling Nature Reserve, Chebaling ; 24°42'52.57"N, 114°15'46.78"E; 447 m a. s. l.; 22–28.VII.2008; NO. 202003656 ; coll. Zaifu XU; yellow plates . China • 1 ♂; Guizhou Province, Daozhen Gelao Nationality and Miao Nationality Autonomous County, Dashahe National Nature Reserve ; 29°7'54.23"N, 107°35'42.65"E; 1365 m a. s. l.; 08.VIII.2004; NO. 200707326 ; coll. Shujun WEI; sweep net . China • 1 ♂; Hubei Province, Yichang City, Changyang County, Hejiaping Town, Qinggangping village ; 30°37'51.18"N, 110°54'6.83"E; 1000 m a. s. l.; 03.VII.2012; coll. Hao ZHANG; sweep net . All types deposited in YNAU.

Diagnosis.

The new species is similar to Psen dzimm Tsuneki, 1959 , sharing with it the following: 1) posterior margins of gastral terga I – V with dense, long and gold erect setae; 2) petiole cylindrical in cross section, lateral surface without longitudinal carina or depression; 3) clypeal middle lobe with shallow, arcuate emargination, side with two arcuate protrusions; 4) gastral sterna III – IV with gold fasciculate setae on hind margins in male. It differs from Psen dzimm and other congeners by the following characteristics (characters of P. dzimm given in parentheses): 1) propodeal enclosure triangular, its marginal ridge inconspicuous and absent on posteriorly lateral half, propodeal pad with dense, slender, oblique longitudinal rugae; lateral surface of propodeum with oblique, short rugae and fine punctures (propodeal enclosure with complete marginal ridge; propodeal pad without longitudinal ruga; lateral surface of propodeum without ruga or puncture); 2) scutum with sparse, tiny punctures anteriorly, remainder with dense, fine to midsize punctures (scutum more grossly, conspicuously, closely punctate); 3) mid basitarsus with row of mid-length spines on externoventral surface, apically with long spine, hind tibia with four or five short thick brownish spines on outer surface in male (mid basitarsus simple, hind tibia without spine); 4) male antennal articles V – XIII beneath with elliptical excavation, article V smaller, and remainder articles larger (articles VI – XIII each with tubercle beneath near base and an excavation near apex); 5) ratio: body smaller, female 12 mm, male 10.7–11.7 mm; HW: HLF: HLD: POD: OOD: OCD = 114: 45: 47: 11: 15: 21 (female 13–14 mm, male 11.5–12 mm; HW: HLF: HLD: POD: OOD: OCD = 85: 35: 34: 10: 12: 15).

Description.

Female. Body length 12 mm. Black; mandible basally, trochanters, fore tibiae, inner surface of fore and mid femora and tarsi, lateral upper surface of mid femora and tibiae externally, basal half of hind femora and most of hind tibiae yellow. Scape basally and apically and tegulae yellowish brown. Apex of gastral terga I, II – III totally and pygidial plate reddish brown; terga and sterna IV – V with hill shaped yellowish brown stripes. Appressed setae on clypeus gold; frons, vertex, scutum, scutellum and metanotum with appressed gold pubescence and long erect setae; propodeum, and ventral side of petiole with pale yellow pubescence and long setae. Mid-length setae on prepectus, mesopleuron, mesosternum, and trochanters silvery; legs with short, pale yellow pubescence; gaster with very short, gold pubescence. Posterior margins of gastral terga I – V with dense, long, gold erect setae (Fig. 3 A, B ).

Head. Clypeus with dense, fine punctures, clypeal middle lobe with shallow, arcuate emargination, side with two arcuate protrusions, basal half of clypeal disk moderately convex (Fig. 3 C ). HW: HLF: AOD: WAS: IAD = 114: 85: 6: 10: 15. Mandible bidentate apically, wide basally: medially: apically = 20: 12: 3. Interantennal tooth conspicuously elevated, apex obtuse or slightly acute; frontal carina conspicuous, extending from median ocellus to apex of interantennal tooth (Fig. 3 C ). Scape slightly bent, pedicel partially concealed within scape, relative lengths of articles III – XII = 28–29, 19, 17–18, 16–17, 15–16, 15, 13–14, 13–14, 13–14, 21; article III approximately 4 × as long as wide apically, article IV about 2.4 ×, article XII about 2.3 ×, respectively (Fig. 3 D ). Frons shiny, with dense, fine punctures, interspaces equal to puncture diameter, on upper part against eyes with an elliptic, slightly raised, almost impunctate arae (Fig. 3 C ). Interocellar area and vertex shiny, with sparse, fine punctures, interspaces 4 × puncture diameter; hind ocellar posterolaterally with wide smooth and impunctate area; ocellar area not raised, behind postocelli without sulcus, vertex behind postocelli not raised, occipital carina crenulate (Fig. 3 E ). HW: HLD: POD: OOD: OCD = 114: 47: 11: 15: 21.

Thorax. Scutum with sparse, tiny punctures anteriorly, remainder with dense, fine to midsize punctures, interspaces 2 × puncture diameter. Anterior admedian lines slightly expended, backward parallel, parapsidal lines and notauli nearly parallel (Fig. 3 F ). Scutellum and metanotum with sparse, fine punctures (Fig. 3 G ). Mesopleuron shiny, with sparse, tiny punctures, posterior margin of mesopleuron with sparse, short striae (Fig. 3 H ). Metapleura shining, without stria or puncture (Fig. 3 H ). Mesosternum without acetabular carina, with inconspicuous, longitudinal medioventral carina; medially without transverse carina. Propodeal enclosure broadly triangular, its marginal ridge inconspicuous and absent on posteriorly lateral half, slightly depressed, shining, laterally with some slightly inconspicuous, longitudinal carinae; propodeal pad with dense, slender and oblique longitudinal rugae (Fig. 3 G ). Posterior surface of propodeum with irregular reticulate ridges reaching propodeal enclosure (Fig. 3 I ). In profile, dorsal surface of propodeum together with posterior surface nearly arcuate, lateral surface of propodeum with oblique, short rugae, fine punctures (Fig. 3 H ). Second submarginal cell receiving first recurrent vein at about basally 1 / 3; second recurrent vein received by third submarginal cell (Fig. 3 B ). Hind tibia with row of long, thick, brownish spines on outer surface, basally with three rows of spines (Fig. 3 B ).

Gaster. PL: PW: LT I: WT I: HFL: HTL = 84: 15: 69: 77: 80: 90. Petiole cylindrical in cross section, slightly bent upwards basally, slightly widened backwards, width apically 1.8 × basally, dorsally smooth (Fig. 3 B, G ). Lateral surface without carina or depression, and with sparse, tiny punctures (Fig. 3 B ). Gastral terga sparsely, finely punctate, base of terga III – IV smooth, impunctate. Pygidial plate broadly triangular, 1.5 × as long as wide basally, medially with small inverted-triangular convexity, shiny and smooth, remainder with coriaceous sculpture, dense, fine to midsize punctures and stiff bristles, apex rounded (Fig. 3 J ).

Male. Similar to female, but smaller, body length 10.7–11.7 mm. Antennae beneath yellow, above yellowish brown; legs and gaster except first gastral segment almost yellow. Gastral sterna III and IV with gold fasciculate setae on hind margins. Appressed setae on clypeus silvery; frons, vertex, scutum, scutellum and metanotum with appressed pale yellow pubescence and long erect setae; mid-length setae on prepectus, mesopleuron, trochanters, propodeum, and ventral side of petiole silvery; gaster with dense, short, golden pubescence (Fig. 4 A, B ). Antennal articles V – XIII beneath with elliptical excavations, article V smaller, remaining articles larger; relative lengths of articles III – XIII = 20–23, 16–17, 15, 13–15, 13, 13–15, 13–14, 13, 12–13, 12–13, 18; article III approximately article 2.5–2.9 × as long as wide apically, article IV about 1.8 ×, article XII about 1.4 ×, respectively (Fig. 4 D ). In front view, HW: HLF: AOD: WAS: IAD = 83: 60: 5: 7: 10; in dorsal view, HW: HLD: POD: OOD: OCD = 94: 72: 11: 14: 19. Lateral basal 1 / 3 of mid tibia significantly widened and base of mid basitarsus with row of mid-length spines on externoventral surface and apically with long spine; hind tibia with four or five short, thick, brownish spines on outer surface (Fig. 4 J, K ). PL: PW: LT I: WT I: HFL: HTL = 66: 13: 60: 67: 67: 77. Genitalia large, yellowish-brown, upper part lighter than basally, gonostyle slender, long, inner (or dorsal) narrow margin with translucent membrane apically, outer (or ventral) margin and apex provided with fringe of sparse, long setae (Fig. 4 L – O ). Volsellar digitus flattened, hollowed ventrally, with apex subquadrate and turned ventrally (Fig. 4 L – O ).

Distribution.

China ( Hubei, Hunan, Guangdong, Guizhou).

Etymology.

The specific name is derived from Latin stem: spini - (= spinulate) and Latin word - tarsalis (= tarsal), referring to the basal mid tarsomere with row of mid-length spines on externoventral surface and apically with long spine (Fig. 4 J, K ).

Figures

Figure 3. Psen spinitarsalis Deng & Ma, sp. nov. Female. Holotype. A. Habitus, dorsal view; B. Habitus, lateral view; C. Head, frontal view; D. Antennae; E. Head and pronotum dorsal view; F. Scutum and scutellum, dorsal view; G. Metanotum, propodeum and petiole, dorsal view; H. Thorax, lateral view; I. Propodeum, posterior view; J. Pygidial plate, dorsal view. Scale bar: 1 mm.

Figure 4. Psen spinitarsalis Deng & Ma, sp. nov. Male. Paratype. A. Habitus, dorsal view; B. Habitus, lateral view; C. Head, frontal view; D. Antennae; E. Head and pronotum dorsal view; F. Scutum, dorsal view; G. Scutellum, metanotum and propodeum, dorsal view; H. Propodeum, posterior view; I. Thorax, lateral view; J. Mid tarsus, lateral view; K. Mid tibia and tarsi, ventral view; L. Male genitalia, dorsal view; M. Male genitalia, ventral view; N, O. Male genitalia, lateral view. Scale bar: 1 mm.