Passaloecus labrinigratus Ma et Li, 2012

Ma, Li & Li, Qiang, 2012, Key to the Oriental species of Passaloecus Shuckard (Hymenoptera: Crabronidae), with descriptions of four new species from China, Zootaxa 3329 (1), pp. 41-50 : 44-45

2. Passaloecus labrinigratus Ma et Li , sp. nov. ( Figs. 10–12 , 29 )

Diagnosis: This species can be distinguished from the similar P. singularis Dahlbom (1844) by the following combination of characters: antero-lateral angle of pronotal collar moderately produced; scutal patches present; scrobal sulcus deeply impressed, distinctly crenate; gaster slightly constricted between terga I and II; pronotal lobe black. P. singularis Dahlbom has the following characters: pronotal collar without antero-lateral angle; scutal patches absent; scrobal sulcus lacking; gaster distinctly constricted between terga I and II; pronotal lobe ivory.

These two species can be distinguished from the other species of the genus by the following combination of characters: interantennal tubercle inconspicuous; frontal median carina lacking; gena, median and upper frons distinctly leathery; pronotal collar with sturdy anterior carina; hypersternaulus and episternal sulcus distinctly crenate; petiole short.

Description: Female. Body length 6.0–6.3 mm. Black; inner margin of mandible largely yellow, apical margin somewhat reddish brown; labrum, tegula and forewing vein dark brown to black; scape beneath yellow; palpi, pedicel, flagellomere, pronotal lobe, petiole, and gastral segments black; tarsi somewhat dark brown. Setae on clypeus sparse, slightly elongate, silvery ( Fig. 10 ).

Mandible bidentate apically. Labrum slightly constricted subapically. Clypeus slightly convex medially, with sparse, fine punctures that are 3–5 × diameters apart, slightly leathery; free margin broadly produced medially, truncate apically ( Fig. 10 ). Lower frons coarsely leathery; interantennal tubercle inconspicuous; frontal median carina lacking. Median and upper frons distinctly leathery, with large, dense punctures, punctures sometimes contiguous. Ocellar triangle area slightly convex, slightly leathery, with midsize to large, sparse punctures. Vertex with midsize, dense punctures that are 1–2 × diameters apart, and dense, slender, transverse striation, distinctly leathery. Gena with midsize to large, dense punctures that are 2 × diameters apart, distinctly leathery. Occipital carina usual, single carina. HW: HLD: HLF = 73: 41: 64; HW: EWd: EW: TW: EL = 73: 16: 24: 23: 53; POD: OOD: OCD = 11: 11: 15; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 25: 6: 7: 5: 7: 6.

Pronotal collar with sturdy anterior carina, antero-lateral angle moderately produced. Scutum coarsely leathery, with midsize to large, dense punctures that are 0–1 × diameters apart; scutal patches present, oval; admedian line distinct, extending to one third of scutum; prescutal sutures distinctly impressed, extending to one third of scutum; parapsidal line distinct, long. Scutellum shiny, with midsize, dense punctures that are 1–2 × diameters apart. Metanotum with tiny, sparse punctures that are 2–4 × diameters apart. Mesopleuron slightly leathery, with midsize to large, dense punctures that are 0–2 × diameters apart, posterior area with short, sparse, longitudinal rugae; scrobal sulcus deeply, narrowly impressed, distinctly crenate, crenation sometimes lacking; hypersternaulus and episternal sulcus widely, distinctly crenate; omaulus absent. Metapleuron shiny. Propodeal enclosure not delimited by carina, with strong, irregular reticulation ( Fig. 11 ); posterior surface with strong, irregular reticulation ( Fig. 11 ); lateral surface with dense, slender, oblique longitudinal rugae anteriorly, and sturdy reticulation posteriorly.

Petiole short ( Fig. 12 ); PL: PW: LTI: WTI = 5: 11: 50: 53. Gastral segments half mat, slightly leathery, with fine, dense punctures that are 1–3 × diameters apart; sternum I without keel; sternum II deeply impressed basally; gaster slightly constricted between terga I and II; pygidial plate lacking.

Male: unknown.

Specimen examined: Holotype: ♀, China: Yunnan: Lijiang: Ninglang: Laduhe River , 27°13'N 100°51'E, 3.X.2006, coll. Tingjing Li ; Paratypes: 1 ♀, China: Yunnan: Baoshan: Longyang: Lujiang : Pumanshao , 24°55'N 98°47'E, 21.VII.2006, coll. Jie Zeng ; 1♀, China: Yunnan: Kunming: Heilongtan Pool , 25°08'N 102°44'E, 24.III.1981, coll. Chikun Yang. All specimens are deposited in the Insect Collections of Yunnan Agricultural University, Kunming, Yunnan Province, P. R. China .

Distribution: China: Yunnan Provinces.

Etymology: The name labrinigratus is derived from the Latin: labr- (= labrum) and nigratus (= black), referring to labrum dark brown to black, which is one of the main recognition characters of this species.

Figures

FIGURES 10–12. Passaloecus labrinigratus Ma et Li, sp. nov. (Female). 10 Frontal view of head; 11 Dorsal view of propodeum; 12 Dorsal view of gastral tergum I (scale line for figures 10–12: 1 mm).

FIGURES 27–31. 27 & 28. Passaloecus columnaris Ma et Li, sp. nov. (27 Female, dorsal view; 28 Male, lateral view). 29. Passaloecus labrinigratus Ma et Li, sp. nov. (Female, lateral view). 30. Passaloecus multituberculatus Ma et Li, sp. nov. (Male, lateral view). 31. Passaloecus petiolatus Ma et Li, sp. nov. (Male, lateral view).