Dolichogenidea concentricus Liu & Chen, 2018

Liu, Zhen, He, Jun-Hua & Chen, Xue-Xin, 2018, The laevigata - group of the genus Dolichogenidea Mason, 1981 from China, with descriptions of 26 new species, Zootaxa 4436 (1), pp. 1-74 : 20-21

Dolichogenidea concentricus Liu & Chen , sp. n.

Figures 9 , 36

Description. Female. Body length 2.6 mm, fore wing length 3.0 mm.

Head. Transverse in dorsal view, 2.1× as wide as long and narrower than mesoscutum (27.0:35.0). Temple shiny and indistinctly punctate, constricted. Face relatively shiny, pubescent, inner margin of eyes parallel, transverse, 0.7× as high as wide. Ocelli relatively small, distance between fore and a hind ocellus equal with diameter of an ocellus, posterior imaginary tangent to fore ocellus virtually touching hind two ocelli, POL:OD:OOL=5.0:2.5:4.5. Antenna as long as body, penultimate antennomere subcubic.

Mesosoma. Length:breadth:height=47.5:35.0:34.0. Disc of mesonotum relatively shiny, with silvery pubescence, finely punctate, interspaces not smaller than diameter of punctures. Scutellar sulcus nearly straight, narrow with sparse carinae in between. Scutellum shiny, with shallow sparse punctures. Propodeum dull, with setose macro-punctures anterior-laterally, base of areola punctate-rugulose, posteral-lateral field polished with a few carinae. Mesopleuron highly polished, with shallow setose punctures anteriorly.

Legs. Spines on outer side of hind tibia dispersed. Inner spur of hind tibia half length of hind basitarsus, outer spur slightly shorter (1/3). Basitarsus of hind leg weakly shorter than tarsomeres 2–4 combined (15.0:17.0).

Wings. Pterostigma 2.6× as long as its widest part. Vein 1-R1 (metacarp) slightly longer than pterostigma, 5.1× as long as its distance from the apex of the marginal cell. Vein r arising from middle of pterostigma, nearly as long as width of pterostigma, vein r slightly longer than vein 2-SR, distinctly angled at their meeting, vein 2-M half of vein 2-SR. 1 st discal cell weakly wider than high. 1 st submarginal cell of hind wing 1.8× wider than high. Vein cu- a nearly straight.

Metasoma. As long as thorax. T1 subparallel, weakly narrowed posteriorly, 1.3× longer than wide posteriorly, concave at basal third, turned-over part rugose, polished inside the concentric arcs. T2 slightly pointed into T3 medially, with weak concentric arcs as T1, 4.0× wider than long in the middle. T3 1.4× longer than T2. Tergites after T2 shiny, polished, pubescent. Hypopygium not longer than apex of abdomen. Ovipositor sheath 2/3 length of hind tibia, expanding towards apex.

Colour. Body black. Tegula black. Spurs pale yellow. Palpi most dirty yellow, dark brown basally. Flagellum and ovipositor sheath evenly brown. Scape and pedicel mostly yellow. Labrum and mandible dark red. Legs dark brown, except fore femur, hind third of mid femur and all tarsi yellow to yellowish brown. Wing membrane hyaline, vein 1-R1, C+SC+R, r, 2-SR, 2-M and pterostigma brown, other veins pale brown, pterostigma with pale basal spot.

Viaration. Fore wing length 2.5–3.3mm.

Male. Unknown.

Host. Unknown.

Material examined. Holotype: ♀, Mt. Longwang, Anji , Zhejiang, 1996. VI.24, Zhang Baoxin, No. 963513 . Paratypes: 1♀, Xianrending, Mt. Tianmu , Zhejiang, 2011. VII.26, Song Shengnan, No. 201101981 ; 2♀♀, Mt. Tianmu , Zhejiang, 1987. VII.21, Chen Xuexin, Nos. 873098, 873052 ; 1♀, Lishui, Zhejiang, 1982.IV–VI, Xu Yue, No. 824075.

Distribution. China (Zhejiang).

Etymology. The specific name “ concentricus ” is Latin adjective, referring to T1 and T2 with weak concentric arcs.

Remarks. This species is similar to D. dilecta (Haliday) but differs from the latter by the following: mesosoma longer than metasoma; T2 distinctly more than half length of T3; posterior half of T1 with scattered shallow punctures; T2 at most slightly uneven; and every tergite relatively shiny and polished.

Figures

FIGURE 9. Dolichogenidea concentricus Liu & Chen, sp. n. a T1–3; b mesonotum and scutellum; c head, dorsal view; d fore wing; e propodeum; f hind wing; g habitus, lateral view; h head, frontal view. Scale line = 0.5 mm.

FIGURE 36. Distribution map of laevigata-group of Dolichogenidea species in China. *: Dolichogenidea changbaiensis Liu & Chen, sp. n.; ■: Dolichogenidea concentricus Liu & Chen, sp. n.; Δ: Dolichogenidea dioryctriphagous Liu & Chen, sp. n.; •: Dolichogenidea fumeus Liu & Chen, sp. n.; ♥: Dolichogenidea funalicauda Liu & Chen, sp. n.;•: Dolichogenidea gansuensis Liu & Chen, sp. n.; Ŧ: Dolichogenidea indicaphagous Liu & Chen, sp. n.