Passaloecus birugatus Bashir & Chen, 2023

Bashir, Nawaz Haider, Li, Wenbo, Liu, Zhuocheng, Xia, Tiyuan & Chen, Huanhuan, 2023, A new species of Passaloecus Shuckard (Hymenoptera, Crabronidae) from China, with a key to Oriental species, ZooKeys 1181, pp. 299-309 : 299

Passaloecus birugatus Bashir & Chen sp. nov.

Figs 19-30 , 31-32

Type materials.

Holotype: China ♀; Yunnan, Shangri-La city, Shangri-La Alpine Garden; 27°90'N, 99°64'E; 8.VI.2020, 3269 m elev.; No. 202051101; coll. Huanhuan Chen. Paratypes: 1♀, same data as for holotype, except No. 202051103; 2♀♀, same data as for holotype, except 15.VII.2021, No. 20214001, 20214002; 1♂, same data as for holotype, except No. 202051102. Specimens are deposited in the Insect Collection of Qujing Normal University, Qujing, Yunnan Province, China.

Diagnosis.

The new species can be easily separated from the similar species P. frontirugatus by the following (characters of P. frontirugatus in brackets): ocellar triangle and vertex behind ocelli finely and sparsely punctate (ocellar triangle and vertex behind ocelli with midsize punctures, close to each other); anterior carina of pronotal collar lacking (strong anterior carina present); notauli distinctly impressed (notauli slightly impressed); mesopleuron posteriorly without longitudinal rugae (mesopleuron posteriorly with short, sparse, longitudinal rugae); petiole distinctly longer than wide (petiole distinctly shorter than wide). The male can be distinguished from the closely related Oriental species P. petiolatus by a distinct interantennal tubercle; flagellomeres III-IX beneath with narrow, long tyloids; admedian line and notauli distinct; scutellum finely punctate; and patterns of propodeum rugae.

Description.

Female (Figs 19-27 , 31 ), body length 6.5 [6.2-6.6] mm.

Colour pattern: body black except the following: labrum, tegula and mandible apically reddish brown, remaining mandible ivory to yellowish [yellow]; palpi ivory [yellow]; scape ivory beneath, black above; pronotal lobe creamy white; forewing veins dark brown and hindwing veins light brown; tibiae and tarsi reddish brown to fulvous, remaining legs black; clypeal setae silvery (Fig. 31 ).

Head: mandible bidentate apically (Figs 19 , 20 ); labrum constricted subapically and slightly wider than clypeal free margin (Fig. 19 ); clypeus somewhat convex medially (Fig. 20 ); clypeal free margin produced medially, slightly convex (Fig. 20 ); clypeal setae 0.2-0.3 mm long, sparse (Fig. 20 ); upper and median frons densely (punctures 1-2 × diameters apart), finely punctate, coarsely coriaceous; inter-antennal tubercle distinct and short, frontal median area slightly impressed; lower frons coarsely coriaceous (Fig. 20 ); ocellar triangle finely, sparsely punctate (punctures 3-4 × diameters apart), slightly coriaceous, slightly convex (Fig. 21 ); vertex behind ocelli with slender, sparse, transverse striations, strongly coriaceous, finely, sparsely punctate (Fig. 21 ); upper gena coarsely coriaceous with fine punctures 1-2 × diameters apart (Fig. 22 ); lower gena slightly coriaceous, finely, sparsely punctate; occipital carina single, without crenulation (Fig. 21 ); HLF: HW: HLD = 65: 84: 50; ELL: EWL: GWL: EWF = 58: 25: 30: 17; WAS: AOD: IAD = 8: 11: 10; EDU: EDL = 52: 50; PD: OD: OOD = 11: 15: 22; SL: PL: LFI: LFII: WFI: WFII = 25: 10: 8: 9: 6: 6.

Mesosoma: pronotal collar anterior transverse carina lacking, antero-lateral corners slightly produced (Fig. 23 ), anterior slope of scutum vertical and high (Fig. 24 ); scutum with fine to midsize, dense punctures (punctures 0-2 diameters apart), coarsely coriaceous, scutal patches absent (Fig. 23 ); admedian line distinct, more than 1/3 of scutum length; notauli distinctly impressed, extending to 1/4 of scutum length, slightly shorter than admedian line; parapsidal line long (300 µm), distinct (Fig. 23 ); scutellum shiny, with fine, dense punctures (punctures 0-1 diameters apart); metanotum finely punctate (punctures 1-2 diameters apart); mesopleuron slightly coriaceous, with fine, sparse punctures, posteriorly without longitudinal rugae; scrobal sulcus weakly impressed, forming a thin line, as long as third hindtarsomere length (Fig. 24 ); omaulus absent; episternal sulcus and hypersternaulus distinctly crenate (Fig. 24 ); metapleuron shiny; propodeal enclosure ecarinate, not delimited laterally, with two strong, longitudinal rugae and irregular, strong, oblique transverse rugae medially (Fig. 23 ); posterior surface with irregular, dense, slender, transverse rugae; lateral surface with oblique, slender, dense, longitudinal striations anterodorsally, without rugae below (flat area), with sparse, weak, longitudinal rugae posteriorly (Fig. 24 ).

Metasoma: petiole longer than wide (Figs 25 , 26 ); gaster finely, sparsely punctate, slightly coriaceous, dull (Fig. 27 ); sternum I in anterior half with slender, longitudinal keel (Fig. 26 ); sternum II slightly impressed basally; gaster not constricted between segments I and II; pygidial plate lacking; PLL: PWD: LMTI: WMTI = 25: 10: 60: 42.

Male (Figs 28-30 , 32 ): same as female, except body length 5.9 mm; labrum not constricted subapically; setae on clypeus dense (Fig. 28 ); clypeal free margin truncate (Fig. 28 ); frons with midsize punctures (punctures 0-1 diameters apart); flagellomeres III-IX beneath with narrow, long tyloids, distal part of flagellomeres V-VIII curved beneath (Fig. 29 ); propodeal enclosure with five strong longitudinal rugae medially and laterally; sternum I without longitudinal keel medially; basal 1/5 of scape beneath ivory, remainder black (Fig. 28 ); HLF: HW: HLD = 57: 73: 40; ELL: EWL: GWL: EWF = 49: 24: 21: 17; WAS: AOD: IAD = 8: 7: 9; EDU: EDL = 48: 38; PD: OD: OOD = 8: 13: 16; SL: PL: LFI: LFII: WFI: WFII = 17: 8: 9: 8: 6: 6; PLL: PWD: LMTI: WMTI = 23: 10: 60: 37.

Distribution.

China (Yunnan).

Etymology.

The name Passaloecus birugatus is derived from the Latin prefix bi - (= two) and the Latin word rugatus (= rugose), with reference to the propodeal dorsal with two strong longitudinal rugae.

Figures

Figures 19 - 30. Passaloecus birugatus sp. nov. 19 clypeus, frontal view 20, 28 head, frontal view 21 head, dorsal view 22 head, lateral view 23 thorax, dorsal view 24 thorax, lateral view 25 petiole, dorsal view 26 petiole, lateral view 27, 30 metasoma, lateral view 29 antenna, dorsal view (Figs 19 - 27 female, 28 - 30 male). Scale bars: 400 µm.

Figures 31 - 32. Passaloecus birugatus sp. nov. 31 female, lateral view 32 male, lateral view. Scale bars: 1000 µm.