Gasteruption dilutum Semenov, 1892

Zhao, Ke-xin, Achterberg, Cornelis van & Xu, Zai-fu, 2012, A revision of the Chinese Gasteruptiidae (Hymenoptera, Evanioidea), ZooKeys 237, pp. 1-123 : 37-38

Gasteruption dilutum Semenov, 1892 Figs 95-102

Gasteryption dilutum Semenov, 1892: 211-212.

Gasteruption dilutum ; Szépligeti 1903: 369; Kieffer 1912: 231, 271; Hedicke 1939: 8.

Type material.

Holotype of Gasteruption dilutum , ♂ (ZISP), "[NW China: Xinjiang,] Oaz. Sandzhu [= Sandhu oasis], 20.VII.[18]90, (1800 m), [B.] Grombtsjevskij", round golden label, " Gasteryption dilutum m., typ. ♂ un., AS. X.[18]91".

Diagnosis.

Head without a depression in front of occipital carina; propleuron 0.8 times as long as mesoscutum in front of tegulae and robust (Fig. 96); occipital carina distinct but non-lamelliform medio-dorsally (Fig. 95); head directly narrowed behind eyes in dorsal view (Fig. 101); temple 0.7 times as long as eye in dorsal view; OOL (♂) 1.2 times as long as diameter of posterior ocellus; third and fourth antennal segments of female unknown, of male fourth segment 1.8 times as long as third segment and 1.1 times as long as second and third segments combined; fifth antennal segment of female unknown, of male 1.7 times as long as third segment (Fig. 99) and penultimate segments unknown; third antennal segment of male normal, 1.8 times as long as second segment (Fig. 99); vertex finely punctulate and with satin sheen; malar space short (Fig. 95); antero-lateral teeth of pronotum obsolescent, only as angulate co rner; mesoscutum robust (Fig. 97), densely setose and partly smooth between separate punctures; marginal cell of fore wing comparatively wide (Fig. 98); hind coxa short and coriaceous, but transversely striate dorsally; hind coxa and femur yellow-brown; pronotal side dorsally and ventrally yellow-brown but medially and posteriorly dark brown; hind basitarsus of male dark brown (but apically somewhat brown) and hind tibia bicoloured (largely yellow-brown, but large ivory basally) and wide (Fig. 102); female tibia unknown; scape and apical half of paramere yellow-brown; colour of ovipositor sheath unknown, but in related species black apically and moderately long.

Description.

Holotype, male, body length 12.9 mm.

Head. Vertex with satin sheen and finely punctulate, densely setose, flat in lateral view and without depression medio-posteriorly (Fig. 95); head directly narrowed behind eyes (Fig. 101); temple 0.7 times as long as eye in dorsal view; fourth antennal segment 1.8 times as long as third segment and 1.1 times longer than second and third segments combined, fifth antennal segment 1.7 times as long as third segment (Fig. 99), third antennal segment 1.8 times as long as second segment; occipital carina non-lamelliform and distinct medio-dorsally; eyes glabrous; ocelli large, OOL 1.2 times as long as diameter of posterior ocellus and POL twice diameter; face moderately wide (Fig. 100); clypeus flat and laterally not protruding; malar space 0.2 times as long as second antennal segment (= pedicellus).

Mesosoma. Length of mesosoma 1.6 times its height; pronotal side normal, ventrally partly smooth, medially crenulate and punctulate dorsally; antero-lateral teeth of pronotum as angulate corners; mesoscutum not protruding anteriorly; propleuron robust and 0.8 times as long as mesoscutum in front of tegulae (Fig. 96); antesternal carina narrow and non-lamelliform; middle and lateral lobes of mesoscutum shiny, densely setose, partly smooth and punctulate between medium-sized punctures and postero-medially reticulate-punctate (Fig. 97); scutellum partly smooth and with few large punctures; propodeum reticulate and densely setose, no median carina; nearly entire mesopleuron coarsely reticulate and densely silvery setose.

Wings. First discal cell parallel-sided and no distinct distal posterior corner and its base vertical (Fig. 98).

Legs. Hind coxa with satin sheen and punctulate, but transversely striate dorsally; length of hind femur, tibia and basitarsus 5.0, 3.6 and 6.6 times their width, respectively; hind tibia wide (Fig. 102), hind basitarsus parallel-sided in lateral view, but distinctly widened basally in dorsal view.

Metasoma. Apical half of parameres of other specimens yellow-brown.

Colour. Black or dark brown; vertex partly brown (Fig. 101); clypeus, mandible, scape, pronotal side dorsally and ventrally, mesoscutum (except medio-posteriorly), metasoma (except first segment), hind tibial spurs and legs (but base of tibiae ivory and hind basitarsus dark brown except its apex) yellow-brown; pterostigma pale brown, but laterally darkened; wings subhyaline.

Distribution.

Palaearctic China (Xinjiang).

Biology.

Unknown. Collected in July at 1800 m.