Passaloecus margdentatus Li & Ma sp. nov.

Figs 4 A – G

Type material.

Holotype: China • ♀; Yunnan, Shangri-La City, Jiantang Town, Lindu Village; 27°47'24"N, 99°48'36"E; 3321 m elev.; 13. VII. 2022; coll. Huifen Jiang; Yellow Plates (YNAU) . Paratype: China • 1 ♀; Yunnan, Shangri-La City, Jiantang Town, East Ring Road; 27°50'24"N, 99°46'48"E; 3373 m elev.; 14. VII. 2022; coll. Lili Dong; sweep net (YNAU) .

Diagnosis.

This species is distinguished from P. tuberangustus Bashir & Ma, 2019 and other congeners by the following characteristics: in female, free margin of clypeus with 3 distinct teeth; hypersternaulus smooth, not crenate; anterior margin of pronotal collar with slender, transverse carina; propodeal enclosure with irregular rugae medially, and sparse, irregular, oblique rugae laterally; pronotal lobe black. Passaloecus tuberangustus has the following characters: in female, free margin of clypeus with shallow emargination medially, in male, free margin of clypeus truncate; hypersternaulus distinctly crenate; pronotal collar without anterior, transverse carina; propodeal enclosure with dense, slender, longitudinal rugae, and interspersed with several, short, transverse rugae medially; pronotal lobe ivory.

Description.

Female. Measurements. ♀, BL: 8.5 mm; HLF: HW: HLD = 77: 85: 42; HW: EWd: EW: TW: EL = 85: 20: 25: 50: 58; POD: OOD: OCD = 9: 12: 26; SL: PL: LFI: LFII: WFI: WFII = 35: 7: 11: 10: 6: 7; WAS: AOD: IAD = 6: 7: 7; EDU: EDL = 38: 37; PLL: PW: LTI: WTI = 20: 13: 52: 55.

Color pattern. Body black; mandible ivory except apex reddish-brown; margin of labrum ivory, central part brown; palpi brown to reddish-brown; scape ventrally ivory; tegula and forewing veins dark brown; fore leg: femur reddish-brown basally, tibia and tarsus yellowish-brown to dark brown; mid and hind tibiae and tarsis dark brown; sides of lower frons and clypeus with scattered, silvery, short setae; outer margin of mandible with scattered, golden, long setae.

Head. Mandible with two blunt teeth apically, inner tooth large (Fig. 4 A). Labrum broad V-shaped, apex thickened, weakly constricted subapically (Fig. 4 A). Clypeus coriaceous, nearly flat, with several, fine punctures basally; free margin of clypeus slightly produced, with three distinct teeth medially, all teeth moderately upturned, median tooth large, area between teeth deeply emarginated (Fig. 4 A). Sides of lower frons coarsely coriaceous; scapal hollow shiny, coriaceous, shallow, clearly defined; interantennal tubercle narrow and short; frontal median carina very weakly impressed; median and upper frons coarsely coriaceous, slightly convex, with dense, midsize punctures (Fig. 4 A). Ocellar triangle coriaceous, moderately convex, with sparse, fine to midsize punctures (Fig. 4 B). Occipital carina narrow, not crenate (Fig. 4 B). Inner and outer orbital furrows lacking (Fig. 4 A).

Mesosoma. Anterior margin of pronotal collar with weak, transverse carina, antero-lateral corner absent (Fig. 4 C). Scutum coarsely coriaceous, with dense, fine to midsize punctures, anterior area nearly right angle, significantly higher than pronotum; scutal patches absent; admedian line distinct, weakly impressed, extending to 2 / 5 of scutum length; notaulus distinct, weakly impressed, extending to 1 / 3 of scutum length; parapsidal line distinctly impressed, long (Fig. 4 C). Scutellum shiny, with dense, fine to midsize punctures (Fig. 4 C). Metanotum shiny, with sparse, tiny punctures (Fig. 4 C). Mesopleuron coriaceous, with sparse, fine to midsize punctures, posterior area smooth, without rugae; scrobal suture broad, shallowly impressed and weakly crenate; episternal sulcus broad, deeply impressed and conspicuously crenate; hypersternaulus with broad, deeply impressed, smooth, not crenate; omaulus absent (Fig. 4 D). Metapleuron shiny, coarsely coriaceous (Fig. 4 D). Propodeal enclosure matte, not delimited by carina, with irregular rugae medially, and sparse, irregular, oblique rugae laterally; posterior surface of propodeum coarsely coriaceous, with median, longitudinal rugae and several, irregular, transverse rugae (Fig. 4 E); lateral surface of propodeum with dense, slender, oblique rugae, anteriorly, and with sturdy oblique rugae posteriorly (Fig. 4 D).

Metasoma. Petiole long, conspicuously longer than width (Fig. 4 F); dorsal surface with conspicuous median, longitudinal groove (Fig. 4 F); lateral surface of petiole with two sturdy, longitudinal, carinae (Fig. 4 G). Gaster shiny, impunctate; sternum I with distinct, median, longitudinal carina and several, short, longitudinal rugae; sternum II shallowly impressed basally; gaster distinctly constricted between terga I and II (Fig. 4 G); pygidial plate lacking.

Male. Unknown.

Distribution.

China (Yunnan).

Etymology.

The name margidentatus is derived from the Latin marg - (= margin), and the Latin word dentatus (= dental), referring to the free margin of clypeus with three distinct teeth medially.