Dibrachys qinghaiensis Jiao & Xiao

Jiao, Tian-yang, Yao, Qin-ying & Xiao, Hui, 2017, Review of Dibrachys Foerster from China (Hymenoptera, Chalcidoidea, Pteromalidae), ZooKeys 656, pp. 123-149 : 142-144

Dibrachys qinghaiensis Jiao & Xiao sp. n. Figs 42-47

Diagnosis.

The new species belongs to Dibrachys s. str., and the mainly differences with Dibrachys microgastri ( Bouché) are as follows: antenna of Dibrachys qinghaiensis sp. n. slender, each funicular segment at least slightly longer than its broad; antennal scape as long as eye height, and nearly reaching lower margin of anterior ocellus; but Dibrachys microgastri ( Bouché) at least with several transverse funicular segment in distal of antenna, antennal scape distinctly shorter than eye height, and not reaching lower margin of anterior ocellus.

Description.

Holotype. Female. Body (Figs 42, 43) length 2.2 mm. Head and mesosoma dark green, with brown gloss and metallic reflection; gaster dark brown. Antenna with scape and pedicel yellowish brown, but brownish in dorsum, other segments of antenna dark brown; mandible yellowish brown and margin of teeth brownish; legs yellowish brown except coxae concolorous with body; fore wing hyaline, wing venation light yellow.

Head in frontal view, 1.27 × as wide as high (Fig. 45); frons with very dense reticulation; antennal scrobe with rather large reticulation; lower face flat, with densely transverse striation except lower edge of clypeus smooth; eye height 0.64 × head height, eyes separated by 1.23 × eye height; scrobe shallow, extending upwards but not reaching anterior ocellus. Antennal insertion slightly above lower ocular line, distance from upper margin of torulus to anterior ocellus 1.58 × distance from lower margin of torulus to lower margin of clypeus; clypeal margin protruded, emarginate in middle with two small blunt teeth; oral fossa width 0.59 × head width. Head in lateral view (Fig. 44) with malar sulcus inconspicuous, eye height 2.2 × malar space. Antennal scape as long as eye height, nearly reaching lower margin of anterior ocellus; length of pedicel and flagellum combined shorter than head width (0.85 ×); pedicel in lateral view 3 × as long as broad; anelli transverse; each funicular segment slightly longer than broad; each funicular segment with one row of longitudinal sensilla; clava slightly clavate, 2.57 × as long as broad, micropilosity only limited to apex of third clava segment. Head in dorsal view 2 × as wide as long, vertex convex, occipital carina strong; eye length 1.87 × temple; POL 1.49 × OOL.

Head width 1.31 × as broad as thorax. Mesosoma 1.43 × as long as broad. Pronotum with coarse reticulation, 0.87 × as broad as thorax; pronotum with middle length 0.23 × as long as mesoscutum, collar subhorizontal and not margined, posterior margin smooth. Mesoscutum 2 × as broad as long, with finely dense reticulation (Fig. 46), posterior reticulation larger than anterior reticulation; notauli incomplete but conspicuous anteriorly. Scutellum flat, as long as broad, frenal line absent; finely reticulate. Propodeum medially 0.43 × as long as scutellum, central area flat and with regular reticulation; plicae complete and parallel anteriorly, separated by 1.82 × medial length of propodeum; median carina complete; propodeum with short, convex nucha; spiracles elongate, 2 × as long as broad, separated by the width of spiracles from hind margin of metanotum; area below spiracles with conspicuous and deep reticulation. Fore wing (Fig. 47) 2.38 × as long as broad, without marginal fringe; upper surface densely pubes cent; basal vein with sparse setae, basal cell bare, speculum only stretched to the base of marginal vein; upper surface of costal cell bare, lower surface with one complete row of setae and distal 1/3 with two rows of short setae; submarginal vein 2.37 × as long as marginal vein; marginal vein 2.64 × as long as stigmal vein; postmarginal vein as long as marginal vein; stigmal vein slightly curved.

Petiole invisible dorsally. Gaster long ovate, 2 × as long as broad; 0.89 × as broad as thorax width, 1.33 × as long as length of mesosoma; surface of each tergite coriaceous; Gt1 covering 1/3 of gaster, posterior margin straight and with small hollow in middle; posterior margin of other tergites straight; terminal acute.

Male. Body length 1.3-1.9 mm, head and mesosoma black, with yellow-green shine; antennae yellow; legs yellow except coxae concolorous with body. Antennae with long hair, each funicular segment longer than its broad, with long hair on antenna. Gaster ovate, with an oval pale spot between Gt1 and Gt2.

Material examined.

Holotype. China: ♀, Qinghai: Golmud, Guolemude, 2880m, 36.26°N, 94.53°E, 14.IX.2001, leg. Chao-Dong Zhu. Paratype. China: 5♂, 4♀, same data as holotype; 2♀, Qinghai: Delhi, Baingoin, 2900m, 16.IX.2001, leg. Chao-Dong Zhu; 1♀, Qinghai: Qilian, 2790m, 19.IX.2001, leg. Chao-Dong Zhu; 2♀, Qinghai: Dulan, Xiangride, 10.VI.1997, leg. Chao-Dong Zhu; 4♀, Qinghai: Xining, 3-4.VI.1997, leg. Chao-Dong Zhu; 2♀, Qinghai: Tongren, Mailin, 14.VI.1997, leg. Chao-Dong Zhu.

Etymology.

The specific name is consist of the spelling of the type locality “qinghai” and the suffix “-ensis” represent source.

Hosts.

Unknown.

Distribution.

China (Qinghai, Yunnan).