Carinostigmus triangularis Bashir & Ma sp. nov.

Figs 5, 6F

Type material.

Holotype: ♀, China: Yunnan: Jinghong: Menghai: Bulang Mountain, 21°56'N, 100°26'E, 20.VI.2018-20.VII.2018, No. 2019000381, coll. Malaise trap (YNAU); Paratypes: 3♀, same locality as holotype, No. 2019000378, 17.V.2018-20.VI.2018, No. 2019000151, 25.IV.2018-17.V.2018, No. 20190329.

Diagnosis.

Differs from Chinese species of Carinostigmus by the following features: flagellomeres I-II fulvous; legs largely black; labrum distinctly constricted subapically; free margin of clypeus slightly turnup apically; inter-antennal tubercle longer than midocellus diameter, slightly broadened at apex; lower gena rugose; pronotal collar with transverse striations medially; metanotum with striations medially; petiole dorsal carinate basally and medially; pygidial area elongate. The new species resembles C. costatus Krombein 1984, but can be distinguished it by the following characters (characters of C. costatus in brackets): labrum distinctly triangular, broader than C. costatus (labrum pentagonal, narrower than new species); clypeus moderately convex (clypeus slightly convex); median and lower frons with transverse, irregular rugae medially and laterally (median and lower frons without rugae); inter-antennal tubercle longer than midocellus diameter, without T-shape projection (inter-antennal tubercle shorter than midocellus diameter, with T-shape projection); upper frons longitudinal carina without groove before anterior ocellus (upper frons with a weak groove before anterior ocellus); vertex behind ocelli impunctate (vertex behind ocelli punctate); lower gena with dense rugae near midventral line (lower gena without rugae near midventral line); pronotal collar lateral angles projected (pronotal collar lateral angles blunt); notaulus shallowly grooved, extending to one third of scutum length (notaulus deeply grooved, extending to half of scutum length); parapsidal line distinct (parapsidal line weakly impressed); metanotum with transverse striations medially (metanotum without striations medially); propodeal enclosure without triangular impression (propodeal enclosure with triangular impression); propodeum laterally with densely rugose (propodeum laterally sparsely rugose); petiole sub quadrate dorsally (petiole cylindrical) and pygidial area very elongate (pygidial area not elongate as new species).

Description.

Female (Figs 5, 6F): length of body 5.5 [5.2-5.7] mm.

Colouration.

Body black and shiny, except for the following: mandible ivory to fulvous (black basally and apically); labrum ivory with dark brown sides; palpi, scape, pedicel and flagellomeres I-II (remainder dark brown) fulvous; pronotal lobe white; tegula and forewing veins dark brown; legs black (fore tibia, fore and mid tarsus fulvous, mid tibia and hind tarsus reddish brown); setae on margin of clypeus and mandible yellowish.

Head (Fig. 5A-D). Mandible tridentate apically; setae on mandible sparse and long; labrum triangular, round at apex, distinctly constricted subapically; clypeus moderately convex, with sparse, coarse punctures; setae on margin of clypeus sparse and long; free margin of clypeus truncate medially, slightly turnup apically (Fig. 5A); median and lower frons distinctly coriaceous, with transverse, irregular rugae medially and laterally, and with a sturdy frontal median longitudinal carina; inter-antennal tubercle longer than midocellus diameter, slightly broadened at apex; upper frons with sparse, fine punctures, longitudinal carina distinct anteriorly, not reaching anterior ocellus (Fig. 5A); ocellar triangle nearly flat, half mat, with fine, sparse punctures; vertex behind ocelli half mat, nearly impunctate (Fig. 5B); gena with several, sturdy, oblique, transverse rugae medially (Fig. 5D); lower gena with dense, sturdy, regular rugae (Fig. 5C); occipital carina narrow, inconspicuously foveolate (Fig. 5B); inner orbital furrow narrow, with inner marginal carina distinct, inconspicuously foveolate (Fig. 5A); outer orbital furrow narrow, hind marginal carina distinct, inconspicuously foveolate (Fig. 5D); length of scape: length of pedicel: length of flagellomere I: width of flagellomere I = 23: 7: 7: 4; maximum head width, dorsally: distance from upper margin of the frons to occipital carina in middle: distance from vertex to clypeal margin in middle = 75: 48: 56; maximum eye length, laterally: maximum eye width, laterally: maximum eye width, frontal view = 47: 21: 18; inner-orbital width, medially: outer-orbital width, medially: occipital carina width, dorsally = 3: 2: 1; maximum width of gena, laterally: distance between antennal sockets, frontal view = 28: 14; distance between inner margins of hind ocelli: distance between outer margin of hind ocellus and nearest inner eye margin: distance between posterior margin of hind ocellus and occipital carina, dorsally = 7: 14: 24.

Mesosoma (Fig. 5E, H, I). Pronotal collar strongly elevated medially, with transverse striations medially, anterior pronotal ridge strong, lateral angles sharp and projected (Fig. 5E); width of collar in middle: length of collar in middle = 11: 36; mesoscutum with coarse punctures, sparsely distributed, posterior area with dense, strong parallel ridges; admedian line weakly impressed, extending to anterior ¼ of scutum length; notaulus shallowly grooved and foveolate, extending to one third of scutum length; parapsidal line distinct; scutellum with coarse, sparse punctures; metanotum with sparse, sturdy longitudinal rugae laterally, and dense transverse striations medially (Fig. 5E); mesopleuron with fine, sparsed punctures, hypoepimeral area with dense, irregular weak striations, posterior area with contiguous, long rugae; omaulus broadened, 1.2 × pedicel length; hypersternaulus broadened anteriorly, 1.3 × pedicel length, narrow apically, 0.5 × pedicel length, distinctly foveolate; scrobal suture long, complete (Fig. 5H); propodeal enclosure deeply impressed, sub triangular, with sturdy, longitudinal rugae anteriorly, reticulate medially; propodeum posterior with sturdy, irregular reticulation (Fig. 5I); propodeum laterally with sparse, sturdy, oblique, longitudinal rugae anteriorly, and irregular reticulation posteriorly (Fig. 5H).

Metasoma (Fig. 5F, G, J, K). Petiole dorsal sub quadrate (not cylindrical), carinate basally and medially, basal width of petiole narrower to its apical width (Fig. 5F), petiole laterally with few weak carinae (Fig. 5G); maximum width of petiole, dorsally: length of petiole, laterally: maximum length of metasomal tergum I, dorsally: maximum width of metasomal tergum I, dorsally = 8: 54: 24: 30; metasoma half mat, with fine, sparse punctures (Fig. 5J); pygidial area smooth, very elongate, 1.8 × pedicel length (Fig. 5K).

Male. Unknown

Distribution.

China (Yunnan).

Etymology.

The name, Carinostigmus triangularis, is derived from the Latin word triangulus (= triangle), referring to the triangular shape of the labrum.