Dolichogenidea gansuensis 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 : 28-31

Dolichogenidea gansuensis Liu & Chen , sp. n.

Figures 13 , 36

Description. Female. Body length 2.7 mm, fore wing length 3.1 mm.

Head. Rather transverse in dorsal view, 2× as wide as long and 0.9× as wide as mesoscutum. Temple shiny and indistinctly punctate, not constricted. Face shiny, superficially punctate and more pubescent, inner margin of eyes subparallel, transverse, 0.8× as high as wide. Ocelli relatively small, distance between fore and a hind ocellus not longer than diameter of an ocellus, posterior imaginary tangent to fore ocellus slightly touching hind two ocelli, POL:OD:OOL=5.0:2.0:4.0. Last four antennomeres missing.

Mesosoma. Length:breadth:height=47.5:31.0:33.0. Disc of mesonotum relatively shiny, very finely and shallowly punctate. Scutellar sulcus curved, finely crenulated. Scutellum shiny, with evenly distributed shallow punctures. Propodeum shiny, with subdued punctures anterior-laterally, with somewhat depression medially which bordered by short carinae at bottom, others shiny with some rugae. Mesopleuron highly polished, with setose indistinct punctures anteriorly.

Legs. Hind coxa shiny without punctures. Spines on outer side of hind tibia relatively dense. Inner spur of hind tibia 3/5 length of hind basitarsus, outer spur nearly 1/2 length of hind basitarsus. Basitarsus of hind leg slightly shorter than tarsomeres 2–4 combined (15.0:17.0).

Wings. Pterostigma 2.6× as long as its widest part. Vein 1-R1 (metacarp) 1.2× longer than pterostigma, 5.6× as long as its distance from the apex of the marginal cell. Vein r arising from middle of pterostigma, nearly perpendicular to it, and as long as width of it, vein r 2× longer than vein 2-SR, angled at their meeting, vein 2-M as long as 1-SR and 4/5 length of vein 2-SR, 2-SR+M as long as 2-SR. 1 st discal cell weakly wider than high (18.0:17.0). 1 st submarginal cell of hind wing1.5× wider than high. Vein cu-a curved.

Metasoma. Weakly shorter than thorax (45.0:47.5). T1 slightly widened to apex, 1.4× longer than hind width, concave at basal third, turned-over strongly rugose and longitudinally striate, concave medial-apically, weakly rugulose along middle and hind. T2 finely longitudinally striate, less transverse, only 2.3× wider than long in the middle, evenly curved apically. T3 as long as T2. Tergites after T2 less shiny with setose punctaitons. Hypopygium not longer than apex of abdomen. Ovipositor sheath only 2/3 length of hind basitarsus, ovipositor narrow.

Colour. Body black. Tegula yellow. Palpi and spurs pale yellow. Antennae and ovipositor sheath evenly dark brown. Labrum and mandible yellowish brown. Legs bright reddish yellow, hind femur weakly infuscate, coxae brown, apical two thirds of hind tibia and hind tarsus dark reddish brown. Wing membrane hyaline, indistinctly fumous, vein C+SC+ R and upper border brown, pterostigma, vein 1-R1, r, 2-SR, 2-M and other veins pale yellowish brown, pterostigma with pale basal spot.

Male. Unknown.

Host. According to the label: an un-identified larva of Geometridae (Lepidoptera) .

Material examined. Holotype: ♀, Tianzhu , Gansu, 1988. VI.22, Yu Jihe, No. 911041, host: larva of Geometridae .

Distribution. China (Gansu).

Etymology. The specific name “ gansuensis ”, referring to it only be found in Gansu province for now.

Remarks. This species is similar to D. indicaphagous Liu & Chen , sp. n., but differs from the latter by the following: metasoma wholly black; ovipositor sheath shorter than hind basitarsus; and vein cu-a of hind wing curved.

Figures

FIGURE 13. Dolichogenidea gansuensis Liu & Chen, sp. n. a habitus, lateral view; b fore wing; c hind wing; d head, dorsal view; e mesonotum and scutellum; f metasoma, dorsal view; g propodeum; h ovipositor sheath; i 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.