Gasteruption dimidiatum 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 : 38-39

Gasteruption dimidiatum Semenov, 1892 Figs 103-110

Gasteryption dimidiatum Semenov, 1892: 210-211.

Gasteruption dimidiatum ; Szépligeti 1903: 369; Kieffer 1912: 229, 263; Hedicke 1939: 9.

Type material.

Holotype of Gasteruption dimidiatum , ♀ (ZISP), “79396” [= Uzbekistan, Amu Darja River, Petro-Alexandrovsk (= Turtkul), VI.1875, Mielberg]", round golden label, " Gasteryption dimidiatum m., typ. ♂ un., AS. XI.[18]91".

Additional material.

1 ♀ (ZJUH). "[China:] Xinjiang, Urumqi, 14-21.VII.1991, Jun-hua He"; 1 ♀ (ZJUH), "[China:] Xinjiang, Qitai, V.1986"; 1 ♀ (RMNH), "[China:] Xinjiang, Urumqi, 1978, Wen-liang Ma"; 1 ♀ (ZJUH), "[China:] Xinjiang, Shihezi, 1981, Fu-de He"; 1 ♀ (ZJUH), "[China:] Xinjiang, Aertai, Jian-xin Kang".

Diagnosis.

Apex of ovipositor sheath narrowly ivory (Fig. 110), at most 0.3 times as long as hind basitarsus; ovipositor sheath 1.0-1.3 as long as body; occipital carina narrow, non-lamelliform medio-dorsally (Fig. 103) and protruding laterally (Fig. 103); propleuron robust, 0.7 times as long as mesoscutum in front of tegulae (Fig. 104); antesternal carina narrow; head, laterally mesosoma and scape black; head in anterior view not protruding below lower level of eyes (Fig. 107); in lateral viewcondylarincision of malar space close to eye (Fig. 103); clypeal ventral depression obsolescent and lateral corners hardly protruding; eyes glabrous; fourth and fifth antennal segment 1.1 and 1.0 (♀; of ♂ unknown) times as long as third segment, respectively; apical antennal segment of ♀ 1.2 times as long as third antennal segment and dark brown, as colour of medial segments; mesoscutum and head with satin sheen, head dorsally very finely punctulate and with satin sheen (Fig. 108); mesoscutum partly smooth or punctulate between numerous large punctures, rugose-punctate medio-posteriorly (Fig. 105); hind coxa transversely rugulose dorsally (but posteriorly transversely striate), laterally densely punctulate; hind tibia slender, with ivory ring subbasally, with a moderately convex ventral border (Fig. 106); hind basitarsus moderately long and entirely dark brown (Fig. 106), in dorsal view distinctly widened basally; hind tibial spurs dark brown; first metasomal segment orange or yellow-brown; apical 0.6 of hypopygium incised.

Description.

Holotype, female, body length 12.6 mm.

Head. Vertex and frons with satin sheen and densely and very finely punctulate (Fig. 108), moderately convex medio-posteriorly (Fig. 103); head rather directly narrowed behind eyes and U-shaped emarginate medio-posteriorly (Fig. 108); temple 0.6 times as long as eye in dorsal view; fourth antennal segment 1.1 times as long as third segment and 0.8 times as long as second and third segments combined, fifth antennal segment as long as third segment, third antennal segment 2.6 times as long as second segment; occipital carina narrow, non-lamelliform medio-dorsally; OOL 1.2 times as long as diameter of posterior ocellus; face rather wide (Fig. 107); minimum width of malar space 0.4 times as long as second antennal segment (Fig. 103); clypeus without distinct depression, its lateral corners hardly protruding forwards and medio-ventrally emarginate; eye glabrous.

Mesosoma. Length of mesosoma 1.8 times its height; pronotal side comparatively low and largely coriaceous, medially crenulate and with small antero-lateral tooth; mesoscutum not protruding anteriorly; propleuron robust, 0.7 times as long as mesoscutum in front of tegulae (Fig. 104); antesternal carina narrow and hardly lamelliform; mesoscutum partly smooth or punctulate between numerous large punctures and rugose-punctate medio-posteriorly, with satin sheen, rather matt (Fig. 105); scutellum punctulate and with some punctures, shiny; meso- and metapleuron densely silvery setose.

Wings. Fore wing: first discal cell subparallel-sided and with outer posterior corner rounded (Fig. 109), glabrous; vein SR1 distinctly bent; marginal cell rather slender (Fig. 109).

Legs. Hind coxa with satin sheen, rather wide, transversely rugulose dorsally (but posteriorly transversely striate), laterally densely punctulate; length of hind femur, tibia and basitarsus 4.5, 4.5 and 5.5 times their width, respectively (Fig. 106); hind tibia 1.1 times as long as hind femur and trochanter combined; middle tarsus 1.2 times as long as middle tibia; middle femur subparallel-sided and slenderer than fore femur.

Metasoma. Ovipositor sheath 5.0 times as long as hind tibia, 3.8 times as lomg as hind tibia and basitarsus combined, 1.6 times metasoma and as long as body; ivory part of sheath 0.3 times as long as hind basitarsus; apical 0.6 of hypopygium slit-like incised.

Colour. Black or dark brown; base of fore and middle tibiae and most of fore and middle basitarsi and subbasal ring of hind tibia ivory; remainder of hind leg (including basitarsus) mainly dark brown; clypeus ventrally, metasoma yellow-brown; pterostigma pale brown, but laterally darkened; wing membrane subhyaline.

Variation. Chinese specimens: Female: body length 12.6-15.5 mm, ovipositor sheath 1.0-1.3 times as long as body, 1.5-1.9 times as long as metasoma, 2.9-3.6 times as long as hind tibia and tarsus combined and 4.4-6.1 times as long as hind tibia; temple 0.5-0.6 times as long as eye in dorsal view; third antennal segment 1.6-1.7 times as long as second segment, fourth antennal segment 1.3-1.4 times as long as third segment, fifth antennal segment 1.0-1.1 times as long as third segment; length of mesosoma 1.8-2.1 times as long as its height; propleuron robust, 0.7-0.8 times as long as mesoscutum in front of tegulae; medio-posteriorly of mesoscutum with medium-sized punctate or coalescent punctates, laterally sparsely punctate or punctate-rugose; length of hind femur, tibia and basitarsus 3.9-4.1, 4.5-4.9 and 5.0-5.8 times their width, respectively; middle tarsus 1.2-1.3 times as long as middle tibia; colour of body mainly black or dark brown; frist tergite orange-brown or black.

Distribution.

Palaearctic China (Xinjiang); Uzbekistan.

Biology.

Unknown. Collected in July and November.