Passaloecus sternoleios Li & Ma, 2024

Li, Jinghong, Ma, Li & Li, Qiang, 2024, Five new species of Passaloecus Shuckard (Hymenoptera, Crabronidae) from China, with a key to Chinese species, Journal of Hymenoptera Research 97, pp. 1141-1161 : 1141-1161

Passaloecus sternoleios Li & Ma sp. nov.

Figs 5 A – H

Type material.

Holotype: China • ♀; Guangdong, Qingyuan City, Fogang County, Guanyin Mountain ; 23°58'12"N, 113°33'49"E; 353 m elev.; 15–16. IX. 2007; Yellow Plates ( YNAU) . Paratype: China • 1 ♀; Guangdong, Shaoguan City, Nanling National Nature Reserve ; 24°54'49"N, 113°2'30"E; 845 m elev.; 23. V. 2020; coll. Fei Ye; flight intercept traps ( YNAU) .

Diagnosis.

This species differs from P. insignis (Vander Linden, 1829) and other congeners by these characteristics: petiole conspicuously longer than width; inner and outer orbital furrows broad, marginal carina conspicuous, outer orbital furrow distinctly crenate; occipital carina broad, conspicuous crenate; notaulus lacking; sternum I smooth, without carina and rugae. Passaloecus insignis has the following characters: petiole not longer than width; inner and outer orbital furrows lacking; occipital narrow, not crenate; notaulus shallowly impressed, crenate; sternum I with sturdy, median, longitudinal carina and several, short, longitudinal rugae.

Description.

Female. Measurements. ♀, BL: 7.8 mm; HLF: HW: HLD = 73: 78: 30; HW: EWd: EW: TW: EL = 78: 20: 26: 33: 60; POD: OOD: OCD = 10: 13: 16; SL: PL: LFI: LFII: WFI: WFII = 28: 6: 7: 7: 5: 5; WAS: AOD: IAD = 6: 5: 7; EDU: EDL = 42: 32; PLL: PW: LTI: WTI = 25: 10: 40: 52.

Color pattern. Body black; mandible ivory except apex yellowish-brown to reddish-brown; central part of labrum with ivory, V-shaped stripe, remainder yellowish-brown; palpi ivory to pale yellow; ventral scape and pronotal lobe ivory; dorsal scape, pedicel, flagellum, tegula, forewing veins yellowish-brown to dark brown; fore leg: apex of trochanter ivory, remainder dark brown, femur dark brown except base and apex yellowish-brown to brown, tibia and tarsus pale yellow to yellowish-brown; mid and hind legs: apex of trochanter, base of femur, ventral tibia and tarsus yellowish-brown, remainder dark brown; sides of lower frons and clypeus with scattered, silvery, short setae; clypeus with sparse, golden, short setae, and interspersed with several golden, long setae apically; labrum with several, golden, long setae apically.

Head. Mandible bidentate apically, inner tooth large (Fig. 5 A ). Labrum slightly narrower than clypeal lobe, heart-shaped, distinctly constricted subapically (Fig. 5 A ). Clypeus slightly convex medially, coriaceous; free margin of clypeus broadly produced, semicircular (Fig. 5 A ). Sides of lower frons coarsely coriaceous, and with irregular, longitudinal rugae; scapal hollow coriaceous, shiny, slightly deep, clearly defined; interantennal tubercle narrow and short; median and upper frons coarsely coriaceous, with sparse, irregular, transverse rugae, frontal median carina strong, extending to anterior ocellus (Fig. 5 A ). Ocellar triangle shiny, moderately convex, with sparse, fine to midsize punctures (Fig. 5 B ). Vertex shiny, with sparse, fine punctures (Fig. 5 B ). Gena shiny, coriaceous, with sparse, indistinct, midsize punctures. Occipital carina broad, conspicuously crenate (Fig. 5 B ). Inner orbital furrow broad, smooth, shiny, boundary carina distinct (Fig. 5 A ); outer orbital furrow broad, distinctly crenate, boundary carina distinct (Fig. 5 H ).

Mesosoma. Anterior margin of pronotal collar with strong, arcuate, transverse carina, antero-lateral corner markedly produced (Fig. 5 C ). Scutum coarsely coriaceous, with dense, fine to midsize punctures, posterior area with several, indistinct, very short, longitudinal rugae; scutal patches absent; admedian line robust, distinctly raised, extending to 1 / 3 of scutum length; notaulus lacking; parapsidal line distinctly impressed, slightly shorter than admedian line (Fig. 5 C ). Scutellum shiny, with dense, fine punctures (Fig. 5 C ). Metanotum smooth and shiny (Fig. 5 C ). Mesopleuron shiny, with scattered fine punctures, posterior area with contiguous, short, longitudinal rugae; scrobal suture lacking; hypersternaulus and episternal sulcus broad, conspicuously crenate; omaulus absent (Fig. 5 D ). Metapleuron shiny and smooth (Fig. 5 D ). Propodeal enclosure shiny, not delimited by carina, with sturdy, irregular rugae medially, and sparse, sturdy, oblique rugae laterally; posterior surface of propodeum reticulated (Fig. 5 E ); lateral surface of propodeum with dense, slender, oblique rugae anteriorly, and irregular reticulation posteriorly (Fig. 5 D ).

Metasoma. Petiole long, conspicuously longer than width, smooth, without carina or rugae (Fig. 5 F ). Gaster shiny, and with sparse, tiny punctures; sternum I smooth and shiny, without carina or rugae (Fig. 5 G ); sternum II deeply impressed basally (Fig. 5 G ); gaster slightly constricted between terga I and II (Fig. 5 H ); pygidial plate lacking.

Male. Unknown.

Distribution.

China (Guangdong).

Etymology.

The name sternoleios is derived from the Greek stern - (= sternum), and the Greek word leios (= smooth), referring to the sternum I smooth and shiny, without carina or rugae.

Figures

Figure 5. Passaloecus sternoleios Li & Ma, sp. nov. (female) A head, frontal view B head, dorsal view C collar, scutum, scutellum and metanotum, dorsal view D thorax, lateral view E propodeum, dorsal view F petiole and tergum I dorsal view G petiole and sternum I ventral view H habitus, lateral view. Scale bars: 1 mm.