3. Passaloecus tuberangustus Bashir & Ma, sp. n.

(Figures 3; 5c, g; 6c, g; 7e, f)

Material examined. Holotype: ♀, China: Gansu: Dangxian: Daheba, 2530m, 35°46’N, 102°54’E, 30.VII.2004, No. 200707825, coll. Shi Min (ZU) . Paratypes: 1♀, same data as holotype; 2♀♀, same data as holotype except No. 200707617, 200707380, coll. Chen Xuexin (ZU); 2♀♀, No. 200707774, 200707775, coll. Wu Qiang (ZU) ; 3♂♂, No. 200707783, 200707761, 200707791, coll. Wu Qiang (ZU) ; 1♂, NO.200707823, coll. Shi Min (ZU); 2♀♀, China: Shanxi: Liuba: Ziboshan Mount, 1632m, 33°32'N, 106°59'E, 3–4.VIII.2004, No. 200707302, 200707846, coll. Shi Min (ZU) .

Diagnosis. This species resembles P. singularis Dahlbom, 1844 in sharing: mandible bidentate apically; labrum distinctly constricted subapically; clypeus slightly convex medially; ocellar triangle moderately convex, slightly coriaceous, with fine, dense punctures; mesoscutum coarsely coriaceous, with midsize dense punctures; notaulus inconspicuously impressed, extending to ⅓ of mesoscutum; parapsidal line conspicuous, long; episternal sulcus conspicuously crenate; metapleuron shiny; propodeal enclosure not delimited by carina, with conspicuous, irregular reticulation; posterior surface of propodeum with irregular rugae, lateral surface shiny anteriorly, nearly smooth, with inconspicuous, dense, oblique, longitudinal striation; metasoma half mat, slightly coriaceous, with fine, dense punctures.

It differs from P. singularis Dahlbom by the following characters: petiole slightly elongate, longer than wide, nearly 3 × as long as midocellar diameter; free margin of clypeus broadly produced medially, slightly concave and turned up apically; metasoma slightly constricted between segments I and II; middle and upper frons with fine, dense punctures; vertex behind ocelli with fine, dense punctures; gena dorsally with fine, dense punctures, coarsely coriaceous; occipital carina usual, simple; pronotal collar without anterior carina; in male, flagellomeres III–VIII beneath with ivory linear tyloids, III, VIII, short, IV–VII, long. In P. singularis Dahlbom the petiole is short, nearly 1 × as long as midocellar diameter; free margin of clypeus truncate, slightly tridentate medially, teeth inconspicuous; metasoma distinctly constricted between segments I and II; middle and upper frons with large, dense punctures; vertex behind ocelli with midsize, dense punctures; gena dorsally with midsize to large, dense punctures, distinctly coriaceous; occipital carina much narrowed throughout, distinctly crenulate ventrally; anterior margin of pronotal collar with strong carina, without antero-lateral corner; in male, flagellomeres II–IX beneath with brownish oval tyloids, II, IX, short, III–VIII, long.

Description. Female and male. Black; labrum, pedicel, and tegula dark brown; palpi ivory; flagellum black, moderately dark brown; pronotal lobe ivory; forewing veins brown. Outer margin of fore tibia with narrow, yellowish band (remaining tibia dark brown), tarsi dark brown, fore trochanter and fore femur slightly dark brown; petiole, and metasoma black but apical segment dark brown.

Mandible bidentate apically (Fig. 3 ad). Labrum distinctly constricted subapically (Fig. 3 ad). Clypeus slightly convex medially, with sparse, fine, punctures, slightly coriaceous, free margin of clypeus broadly produced medially, slightly concave and turned up apically (Fig. 3 ad). Lower frons coarsely coriaceous; interantennal tubercle inconspicuous (Fig. 3 ad); frontal median carina inconspicuous; middle and upper frons coarsely coriaceous, and with fine, dense punctures; ocellar triangle moderately convex, slightly coriaceous, with fine, dense punctures. Vertex behind ocelli with fine, dense, punctures and dense, fine, transverse striation, coarsely coriaceous (Fig. 3b); gena dorsally with fine, dense punctures, coarsely coriaceous. Lower gena with fine, sparse punctures, slightly coriaceous; occipital carina usual, simple.

Pronotal collar without anterior carina or anterolateral angle. Mesoscutum coarsely coriaceous, with midsize dense punctures that are 0–1 × diameters apart, anterior slope vertical and high, nearly 2 × midocellar diameter; scutal patches absent; admedian line conspicuous, extending to ⅓ of scutum length; notaulus inconspicuously im- pressed, extending to ⅓ of mesoscutum; parapsidal line conspicuous, long (Fig. 5c). Scutellum slightly coriaceous, with fine, dense punctures that are 0–1 × diameters apart. Mesopleuron coarsely coriaceous, with fine, sparse punctures; scrobal sulcus inconspicuously impressed; episternal sulcus conspicuously crenate; omaulus absent (Fig. 6c). Metapleuron shiny. Propodeal enclosure not delimited by carina, with conspicuous, irregular reticulation; posterior surface with irregular rugae mixed with dense, fine, transverse rugae (Fig. 5g); lateral surface shiny anteriorly, nearly smooth, with inconspicuous, dense, oblique, longitudinal striation, remainder with fine, long, irregular, oblique longitudinal rugae.

Petiole slightly elongate, longer than wide, nearly 3 × as long as midocellar diameter (Fig. 3c). Metasoma half mat, slightly coriaceous, with fine, dense punctures, sternum I without keel, sternum II deeply impressed basally; metasoma slightly constricted between segments I and II (Fig. 6g).

Female. Body length 4.5–5.6 mm; mandible ivory except black margin; scape ivory beneath, above dark brown; mid tibia, and tarsi dark brown; hind leg black; setae on clypeus sparse, short and silvery (Fig. 3a); HW: HLD: HLF = 74: 36: 62; HW: EWd: EW: TW: EL = 74: 16: 22: 21: 48; POD: OOD: OCD = 9: 13: 16; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 25: 8: 9: 4: 9: 5; metanotum slightly coriaceous, with fine, dense punctures; hypersternaulus conspicuously crenate; PL: PW: LTI: WTI = 15: 9: 42: 37.

Male. Body length 4.4– 5 mm; mandible ivory except reddish brown margin; scape beneath with a small yellowish spot basally, remainder dark brown; mid tibia, and tarsi reddish brown; hind leg dark brown; setae on clypeus dense, slightly elongate, silvery (Fig. 3d); HW: HLD: HLF = 67: 34: 54; HW: EWd: EW: TW: EL = 67: 16: 24: 16: 43; POD: OOD: OCD = 8: 11: 12; length of scape: length of pedicel: length of flagellomere I: width of flagellomere I: length of flagellomere II: width of flagellomere II = 18: 5: 7: 5: 8: 6; flagellomeres III–VIII beneath with linear ivory tyloids (Fig. 3e); metanotum with tiny, sparse punctures; hypersternaulus shallow and short, inconspicuously crenulate; PL: PW: LTI: WTI = 11: 10: 43: 35; spinose tubercles absent on the hind margin of metasomal tergum VI mesally. Genitalia (Fig. 3 f–h).

Distribution. China (Gansu, Shanxi).

Etymology. The name, tuberangustus, is derived from the Latin stem tuber (= swelling) and angustus (= narrow), referring to the male flagellomeres III–VIII beneath with linear tyloids, which is one of the main recognition characters of this species.