Ismarus longus Liu, Chen & Xu

Liu, Jing-xian, Chen, Hua-yan & Xu, Zai-fu, 2011, Notes on the genus Ismarus Haliday (Hymenoptera, Diapriidae) from China, ZooKeys 108, pp. 49-60 : 51-52

Ismarus longus Liu, Chen & Xu sp. n. Figs 1-4

Holotype.

Female. Body length 3.2 mm; fore wing length 3.0 mm.

Description.

Head. Head in dorsal view 2.0 times as wide as long; vertex abruptly sloping behind ocelli; temple narrowed behind eyes; occipital carina strong and complete, not crenulate; POL equals to OOL; toruli separated from each other; face setose; clypeus evenly convex; epistomal sulcus distinct; eyes bare, eye height 4.5 times length of malar space; malar sulcus absent; frons setose just above antennal sockets. Antenna 1.1 times as long as body; scape cylindrical, with apical rim simple; pedicel basally attenuate and apically broad; ratios of length to width of antennal segments: 20: 6; 9: 5; 16: 4; 20: 4; 13: 4; 13: 4; 10: 5; 10: 5; 9: 5; 9: 5; 9: 5; 9: 5; 9: 5; 9: 5; 13: 5.

Mesosoma. Mesosoma in dorsal view 0.8 times as long as width of head; pronotum angular in dorsal view, anteriorly rugose-punctate and setose; central part of lateral side of pronotum smooth, with anterior and upper margins rugose-punctate and setose; mesoscutum smooth and convex, with some sparse long setae near humeral sulcus and notauli; notauli anteriorly present, oblique long and pit-like, crenulate inside; humeral sulcus deep and crenulate, 1.4 times length of tegula; anterior scutellar pit crenulate, with weak median longitudinal carina; scutellum smooth, posterior rim rounded; propodeum rugose, with transverse and longitudinal carinae present; mesopleuron smooth and bare, with upper corner below tegula punctate and setose; metapleuron reticulate-rugose and setose.

Wings. Fore wing with costal, subcostal, basal, marginal, stigmal and postmarginal veins tubular; radial cell closed, 0.6 times length of marginal vein and 3.0 times as long as its height. Hind wing with a basal cell.

Legs. Fore and middle legs slender; hind tibia strongly incrassate.

Metasoma. Petiole transverse, weakly rugose and with longitudinal carinae; second tergite smooth and scattered with a few setae along lower side, median furrow extending to 0.4 length of second tergite; sutures between tergites complete and well impressed; sternites finely punctate and setose.

Colour.

Body black. Antenna black, with scape brown, pedicel and first flagellomere dark brown; mandible black with its apical half reddish brown; palpi black; tegula blackish brown. Legs brown, all coxae black but apically brown; hind femur brown with incrassate part black; hind tibia black with basal 0.2 reddish brown; hind tarsus reddish brown with first tarsomere black. Wings hyaline, veins blackish brown.

Male.

Unknown.

Distribution.

China (Yunnan).

Material examined.

Holotype, female, CHINA: Yunnan, Yingjiang, Tongbiguan (24.60°N, 97.65°E), 2009.V.20, Man-man Wang, No. 200900933. Paratypes: 1 female, same data as type, No. 200900492; 1 female, Yunnan, Tengchong, Jietou Town (25.40°N, 98.70°E), 2009.V.13, Man-man Wang, No. 200902486; 1 female, Yunnan, Tengchong, Jietou Town (25.40°N, 98.70°E), 2009.V.12, Jie Zeng, No. 200902519.

Diagnosis.

This species belongs to the Ismarus halidayi -group of Manser (1976) and is similar to Ismarus halidayi Foerster, 1850, but it differs from the latter by having the second flagellomere 5.0 times as long as wide (2.6 times as long as wide in Ismarus halidayi ), apical antennal segment 2.6 times as long as wide (2.0 times); notauli anteriorly present, oblique long and pit-like, crenulate inside (smooth) and the radial cell of fore wing shorter than marginal vein (radial cell as long as marginal vein).

Etymology.

The specific name refers to the long second flagellomere.