Passaloecus multituberculatus 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 : 45-46

3. Passaloecus multituberculatus Ma et Li , sp. nov. ( Figs. 13–19 , 30 )

Diagnosis: The male of this species can be distinguished from the similar P. singularis Dahlbom (1844) by the following combination of characters: flagellomeres II-X beneath with reddish brown tyloids; antero-lateral corners of pronotal collar markedly produced; mesopleuron shiny, sparsely punctate; gaster slightly constricted between terga I and II. P. singularis Dahlbom has the following characters: flagellomeres II–IX beneath with brownish tyloids; pronotal collar without antero-lateral angle; mesopleuron coarsely leathery, densely punctate; gaster distinctly constricted between terga I and II.

These two species can be distinguished from the other species of the genus by the following combination of characters: gena, median and upper frons conspicuously leathery; vertex with midsize, dense punctures and dense transverse striation; pronotal collar with strong anterior carina; scrobal sulcus just inconspicuously impressed; hypersternaulus and episternal sulcus distinctly crenate; petiole short.

Description: Male. Body length 6.7 mm. Black; inner margin of mandible fulvous at base, remainder reddish brown to dark brown; labrum and tegula fulvous; palpi and pronotal lobe ivory; scape beneath with a small yellowish spot basally, remainder dark brown; pedicel yellow beneath, reddish brown above; flagellomere I–VI yellow, VII–XI beneath somewhat dark brown; forewing vein brown; fore and mid trochanters, fore femur beneath, mid femur largely and hind femur wholly reddish brown to dark brown; hind trochanter, fore femur above, inner margin of mid femur, fore and mid tibiae, apical two thirds of hind tibia and tarsi yellowish to fulvous; basal one third of hind tibia ivory, gastral segments somewhat dark brown. Setae on clypeus dense, somewhat elongate, silvery ( Fig. 13 ).

Mandible bidentate apically. Labrum triangular, not constricted subapically ( Fig. 13 ). Clypeus flat, with midsize, dense punctures that are 0–1 × diameters apart; free margin of clypeus nearly arcuate apically ( Fig. 13 ). Lower frons with irregular, dense, longitudinal rugae laterally, coarsely leathery; interantennal tubercle somewhat distinct, short; frontal median area minimally impressed ( Fig. 13 ). Median and upper frons conspicuously leathery, with large, dense punctures that are 0–1 × diameters apart. Ocellar triangle area slightly convex, shiny, with midsize, dense punctures. Vertex with midsize, dense punctures that are 0–1 × diameters apart, and dense, slender, transverse striation, distinctly leathery. Gena with large, dense punctures that are 0.5–1.5 × diameters apart, distinctly leathery. Occipital carina usual, single carina. HW: HLD: HLF = 91: 49: 76; HW: EWd: EW: TW: EL = 91: 22: 31: 27: 63; POD: OOD: OCD = 13: 13: 22; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 27: 6: 9: 8: 10: 8. Flagellomeres II-X beneath with reddish brown tyloids, II–V small, oval, VI–X long, broad ( Fig. 14 ).

Pronotal collar with strong anterior carina, antero-lateral angles markedly produced. Scutum coarsely leathery, with midsize, dense punctures that are 0–1 × diameters apart, and short, dense, irregular rugae posteriorly; scutal patches absent; admedian line distinct, extending to one third of scutum; prescutal sutures shallowly grooved, crenulate, reaching one third of scutum; parapsidal line distinct, long. Scutellum shiny, with midsize, dense punctures that are 1–2 × diameters apart. Metanotum slightly leathery, with fine, dense punctures that are 0–2 × diameters apart. Mesopleuron shiny, with fine to midsize, sparse punctures that are 1–4 × diameters apart; scrobal sulcus just inconspicuously impressed; hypersternaulus and episternal sulcus widely, distinctly crenate; omaulus absent. Metapleuron shiny. Propodeal enclosure not delimited by carina, with strong, irregular reticulation ( Fig. 15 ); posterior surface with conspicuous, irregular reticulation ( Fig. 15 ); lateral surface with irregular, dense, slender, oblique longitudinal rugae anteriorly, and strong, sparse, oblique longitudinal rugae posteriorly.

Petiole short ( Fig. 16 ); PL: PW: LTI: WTI = 6: 15: 67: 65. Gastral segments half mat, slightly leathery, with tiny, dense punctures that are 0–2 × diameters apart; sternum I without keel lacking; sternum II deeply impressed basally; gaster slightly constricted between terga I and II; spinose tubercles on hind margin of gastral tergum VI mesally present. Male genitalia ( Figs. 17–19 ).

Female: unknown.

Specimen examined: Holotype: ♂, China: Zhejiang: Songyang , 28°26'N 119°28'E, 5.V.1995, NO. 955022, coll. Hanlin Chen. The specimen is deposited in the Parasitic Hymenoptera Collection of Zhejiang University, Hangzhou, Zhejiang Province, P. R. China.

Distribution: China: Zhejiang Provinces.

Etymology: The name multituberculatus is derived from the Latin: multi- (= many) and tuberculatus (= with tubercles), referring to flagellomeres II–X beneath with tyloids, which is one of the main recognition characters of this species.

Figures

FIGURES 13–19. Passaloecus multituberculatus Ma et Li, sp. nov. (Male). 13 Frontal view of head; 14 Ventral view of antennal segments I–XIII; 15 Dorsal view of propodeum; 16 Dorsal view of gastral tergum I; 17 Dorsal view of male genitalia; 18 Lateral view of male genitalia; 19 Ventral view of male genitalia (scale line for figures 13, 15 and 16: 1 mm; for 14: 1.31 mm; for 17, 18 and 19: 1.63 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).