Indothrix brevicornis Li & Xu, sp. nov.

(Figs 9–14)

Material examined. Holotype, ♂, CHINA: Zhejiang, Hangzhou, 17.VI.1981, Kai-ning Rui [SCAU].

Diagnosis. The new species can be separated from the two known species, Indothrix longicornis Krombein and I. wijesinhei Krombein, by the following characteristics: head and mesosomal dorsum without metal reflections (with weak bronzy reflections in the latter two species (Figs 2, 3, 6, 8); antenna distinctly shorter than body length (longer than body length in the latter two species (Figs 1, 5)); F5–F8 each 1.8 times as long as wide (3.8–4.7 times in the latter two species (Figs 1, 5)); mesoscutellum blackish-brown posteriorly (totally black in the latter two species (Figs 2, 8)); dorsal surface of propodeum with pair of blunt longitudinal median ridges on anterior half, flanked by two glossy and impunctate areas (without median ridges on anterior half, and flanked by two coarse rugose areas in the latter two species (Figs 2, 8)).

Description. Holotype. Male. Body length 3.4 mm; fore wing length 2.9 mm; MOL=1.5 MOD; OOL=0.5 MOD; POL=1.5 MOD; MS=2.5 MOD; relative length of S:F1:F2:F3=1.1:1.7:1.1:1.1.

Head. Head with setulae; head width 1.2 times distance from clypeal apex to posterior ocelli; head (except scapal basin) punctate; punctures interspaced by 0.3–1.0 PD; scapal basin moderately concave, transversally rugulate and with longitudinal median ridge (Fig. 13); eye not encircled by carina, strongly bulging with dense microtrichiae (Fig. 13); clypeus smooth, with apical margin not thickened; mandible with two teeth; MS less than half of eye height; ocellar triangle obtuse isosceles; flagellum with dense, erect setulae; flagellar setulae about half as long as width of flagellar segment (Figs 11, 12); F5–F10 with tubercle beneath (Fig. 11); F1 3.4 times as long as wide; F2, F3 each 2.2 times as long as wide; F11 2.8 times as long as wide.

Mesosoma. Mesosoma with setulae; pronotum, mesoscutum, mesoscutellum and metanotum punctate; punctures similar to those on head and interspaced by 0.3–1.0 PD; pronotum moderately convex, with longitudinal median groove on posterior two-third (Fig. 14); notauli complete, slightly diverging anteriorly (Fig. 14); parapsides short, weakly impressed; mesopleuron punctate, punctures interspaced by 0.3–1.0 PD, with small smooth area posteriorly (Fig. 9); metanotum medially 0.8 times as long as mesoscutellum, with V-shaped enclosure area 0.8 times as long as basal width, flanked by two oblongs with irregular rugulae (Fig. 14); metapleuron depressed, mostly glossy and impunctate; dorsal surface of propodeum with pair of blunt longitudinal median ridges on anterior half, flanked by two glossy and impunctate areas, and with several short longitudinal ridges on posterior half (Fig. 14); hind femur l/w= 3.9:1.

Metasoma. Metasoma with setulae; metasomal terga and sterna punctate; punctures on first two metasomal terga and sterna smaller and sparser than those on head and mesosoma, and interspaced by 1.0–2.0 PD; punctures on third and fourth metasomal terga and sterna with closer punctures on anterior half, interspaced by 0.5–1.0 PD, and scattered punctures apically, interspaced by 1.0–1.5 PD; second sternum with posterior margin straight.

Color. Body without metallic reflection (Figs 9, 10); head black; antenna blackish-brown, with scape and pedicel brown; mandible yellowish-brown, with apex dark reddish-brown; mesosoma black except mesoscutellum blackish-brown posteriorly; coxae and trochanters yellowish-brown; femora, tibiae and fore tarsi brown; mid and hind tarsi blackish-brown; wings slightly infumated, stigma and veins brown; metasoma black except first tergum brown.

Female. Unknown.

Biology. Unknown.

Distribution. China (Zhejiang).

Etymology. The specific name “ brevicornis ” refers to the short antenna of the new species.