Dibrachys koraiensis Yang, 1996

Jiao, Tian-yang, Yao, Qin-ying & Xiao, Hui, 2017, Review of Dibrachys Foerster from China (Hymenoptera, Chalcidoidea, Pteromalidae), ZooKeys 656, pp. 123-149 : 129

Dibrachys koraiensis Yang, 1996

Dibrachys koraiensis Yang, 1996: 197-199, 323.

Diagnosis.

Body length 2.5-2.7 mm; gaster long ovate. Head in frontal view 1.25 × as wide as high; antennal scrobe extending upwards and reaching anterior ocellus; lower face slightly convex; antennal insertion placed on lower ocular line; clypeus with longitudinal striation and lower margin slightly protruded, emarginate, and with two blunt teeth; lower angle of gena not exceeding clypeal margin. Antennal scape slightly shorter than eye height (0.87 ×); length of pedicel and flagellum shorter than head width (0.8 ×); anelli transverse; Fu1 and Fu2 slightly longer than broad, Fu3 and Fu4 quadrate, Fu4 and Fu6 slightly transverse. Head in dorsal view 1.88 × as wide as long; eye length 2 × temple length; POL 1.5 × OOL. Mesosoma 1.7 × as long as broad, mid lobe of mesoscutum with relatively coarse sculpture. Propodeum with complete plica and indistinct median carina. Fore wing length 2.2 × width; submarginal vein 2 × as long as marginal vein; marginal vein 2.53 × as long as postmarginal vein, 2.13 × as long as stigma vein; stigmal vein slightly longer than postmarginal vein (1.15 ×). Gaster 1.5 × as long as broad, distinctly broader than thorax width (1.21 ×).

Material examined.

China: 1♀, Heilongjiang: Yichun, 3.VII.1972, leg. Ding-xi Liao; 1♀, Heilongjiang: Hailin, VI.1975, leg. Gui-you Zhang.

Hosts.

Yang (1996) reported this species as reared from the pupae of some chalcid collected from tunnels in Picea koraiensis Nakai ( Pinales : Pinaceae ) built by the wood pest Orthotomicus golovjankoi Pjatnitzky ( Coleoptera : Curculionidae ), the possible host.

Distribution.

China (Heilongjiang).