Lycogaster angustula, Chen, Hua-yan, van Achterberg, Cornelis, He, Jun-hua & Xu, Zai-fu, 2014

Chen, Hua-yan, van Achterberg, Cornelis, He, Jun-hua & Xu, Zai-fu, 2014, A revision of the Chinese Trigonalyidae (Hymenoptera, Trigonalyoidea), ZooKeys 385, pp. 1-207 : 31-33

Lycogaster angustula sp. n. Figs 108-118

Type material.

Holotype, ♀ (ZJUH) "[China:] Zhejiang, Mt. Tianmu, 29.VII.2011, Sheng-nan Son, 201101299". Paratypes: 1 ♀ (ZJUH) "[China:] Zhejiang, Mt. Tianmu, Xianrending, 1520 m, 1.VII.2001, Mei-hua Piao, 200106404"; 1 ♂ (ZJUH), "[China:] Zhejiang, Qingyuan, Mt. Baishanzu, 1856 m, 13.VIII.2003, Xiao-xia Yu, 20058591".

Diagnosis.

Antenna of female elongate and hardly widened medially (Fig. 111); pair of small submedial acute teeth on elevation of second sternite close to each other (Fig. 118); second tergite smooth and strongly shiny (Fig. 116); mesosoma black dorsally.

Description.

Holotype, female, length of body 6.7 mm (of fore wing 5.4 mm).

Head. Antenna with 23 segments, elongate and hardly widened medially (Fig. 111); frons spaced punctate (interspaces much wider than width of punctures) and shiny (Fig. 109); vertex and temple largely smooth with sparse and fine punctures (Figs 110, 113); head subparallel-sided behind eyes, distinctly narrowed posteriorly and 1.1 times wider than mesoscutum (Fig. 110); dorsal length of eye 0.9 times length of temple (Fig. 110); occipital carina narrow lamelliform medio-dorsally and without crenulae; supra-antennal elevations hardly developed as a thin rim and smooth; clypeus weakly emarginate and comparatively thin medio-ventrally.

Mesosoma. Length of mesosoma 1.4 times its height (Fig. 115); mesopleuron below transverse mesopleural groove rugose to punctate anteriorly, largely smooth and shiny posteriorly, above groove similar but rugose anteriorly; transverse mesopleural groove wide, deep and coarsely crenulate; notauli narrow anteriorly, widened posteriorly and coarsely crenulate; middle lobe of mesoscutum sparsely and coarsely punctate anteriorly, rugose at posterior end, lateral lobes sparsely and rather finely punctate (Fig. 114); scutellar sulcus wide, both medially and laterally and coarsely crenulate (Fig. 114); scutellum largely smooth (except some punctures), distinctly shiny, rather flat and anteriorly near level of mesoscutum; metanotum flat, shiny and smooth medially (Fig. 114); propodeum largely obliquely rugulose to rugose with smooth interspaces medially and posteriorly (Fig. 114); posterior propodeal carina thick lamelliform and slightly arched, foramen medially 0.5 times higher than wide basally.

Wings. Fore wing: length of vein 1-M 1.7 times as long as vein 1-SR (Fig. 112).

Metasoma. First tergite 0.4 times as long as apically wide, smooth and with rather distinct elliptical depression medially (Fig. 116); second-fifth tergites largely smooth with sparse fine punctures; sternites sparsely and finely punctate; second sternite strongly convex in lateral view, its medio-apical protuberance with pair of small submedial acute teeth close to each other (Fig. 118); third sternite about 0.1 times as long as second sternite, with distinct ledge (Fig. 117); hypopygium truncate apically (Fig. 118).

Colour. Black; metasoma somewhat brownish; mandibular teeth, palpi and tegulae dark brown; legs dark brown to black with tibiae and tarsi paler; pterostigma dark brown; wing membrane subhyaline.

Variation. Length of body 7.9 mm, of fore wing 6.1 mm; second tergite with pair of small ivory spots medio-laterally; second–fifth tergites rather densely and coarsely punctate.

Male. Length of body 8.7 mm, of fore wing 6.7 mm; antenna with 23 segments and without tyloids; vertex sparsely and rather coarsely punctate; sculpture of mesosoma coarser than that in female; second–fifth tergites and sternites densely and coarsely punctate; genitalia extruded.

Biology.

Unknown. Collected in July–August at 1520-1856 m.

Distribution.

China (Zhejiang).

Etymology.

Named after the elongate and hardly widened antenna of the female: from “elongatus” (Latin for “prolonged”).