Dolichogenidea aegeriphagous 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 : 9

Dolichogenidea aegeriphagous Liu & Chen , sp. n.

Figures 2 , 35

Description. Female. Body length 2.8 mm, fore wing length 3.1 mm.

Head. Transverse in dorsal view, 1.9× as wide as long and narrower than mesoscutum (28.0:31.8). Temple shiny and indistinctly punctate, rather constricted. Face relatively shiny, slightly swelling medially, independently punctate, less pubescent, inner margin of eyes parallel, nearly 0.8× as high as wide. Posterior tangent to the anterior ocellus touching the posterior pair, POL:OD:OOL=5.6:2.0:3.0. Antenna as long as body, penultimate antennomere 1.7× as long as wide.

Mesosoma. Length:breadth:height=56.0:31.8:29.8. Disc of mesonotum shiny, with relatively heavy punctuation, interspaces not larger than diameter of punctures, indistinctly punctuation posteriorly. Scutellar sulcus straight, broad with carinae in between. Scutellum polished without punctuation. Propodeum polished, only with trace of punctuation and two short arms reaching out from orifice. Mesopleuron highly polished, its anterior half with shallow hair punctuation of even size.

Legs. Spines on outer side of hind tibia dispersed. Inner spur of hind tibia a little longer than outer spur, almost 1/2 length of basitarsus, while outer spur somewhat less than 1/2. Basitarsus of hind leg as long as tarsomeres 2–4 combined.

Wings. Pterostigma 2.4× as long as its widest part. Vein 1-R1 (metacarp) slightly longer than pterostigma, 3.7× as long as its distance from the apex of the marginal cell. Vein r distally to middle of pterostigma, shorter than width of pterostigma, vein r slightly longer than vein 2-SR, indistinctly angled at their meeting, vein 2-M half length of vein 2-SR. 1 st discal cell almost as wide as high. 1 st submarginal cell of hind wing 2.1× wider than high. Vein cu-a relatively curved.

Metasoma. As long as thorax. T1 weakly widen posteriorly, 1.1× longer than wide posteriorly, concave at basal 2/5, basal to hind width as 10.5:13.5, shiny, smooth, without punctures. T2 curved into T3 deeply, 3× wider than long in the middle. T3 1.4× as long as T2. Tergites after T1 shiny, smooth. Hypopygium slightly shorter than apex of abdomen. Ovipositor sheath 1.4–1.6× longer than hind tibia, relatively thin.

Colour. Body black. Palpi, tegula and spurs pale yellow. Flagellum and ovipositor sheath evenly dark brown. Labrum and mandible reddish yellow. Legs bright reddish yellow, except coxae dark brown and apical third of hind tibia brown. Wing membrane hyaline, vein 1-R1 and pterostigma brownish, vein C+SC+R, r, 2-SR, 2-M and other veins pale yellow, pterostigma with pale basal spot.

Variation. Fore femur of some specimens black anteriorly.

Male. Similar to female, except: T1 distinctly constricted behind; T2 less transverse; antenna much longer; and legs darker.

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

Material examined. Holotype: ♀, Kuerle , Xinjiang, 1990. VI.7, Zhou Nali, No. 906474 . Paratypes: 2♀♀, Faku , Jilin, 1980. V.22, Li Yajun, host: larva of Aegeriidae, Nos. 948244, 948242 ; 3♀♀ 1♂, Heilongjiang, 1979. V.17, Zhang Runsheng, No. 810376 ; 1♀, Shenyang, Liaoning, 1995.VI–VII, Lou Juxian, No. 960744 ; 1♀, Taiqinggong, Mt. Lao , Shandong, 1995. VIII.3, He Junhua, No. 955732 ; 1♀, Huangshian, Xixia , Henan, 1998. VII.17, Chen Xuexin, No. 989223 ; 1♀, Dongliao, Jilin, 1988. VII.22–31, Lou Xiaoming, No. 888200 ; 1♀ 1♂, Jinshatan, Shanxi, 1983.IX, Linchang, No. 833897.

Distribution. China (Heilongjiang, Henan, Jilin, Liaoning, Shandong, Xinjiang).

Etymology. The specific name “ aegeriphagous ”, referring to that it is a parasitoid of larva of aegeriid.

Remarks. This species is similar to D. laevigata Ratzeburg but can be distinguished by the following: penultimate antennomere 1.7× longer than wide; T3 1.4× as long as T2; and propodeum polished, two short arms reaching out from orifice.

Figures

FIGURE 2. Dolichogenidea aegeriphagous Liu & Chen, sp. n. a propodeum; b habitus, lateral view; c metasoma, dorsal view; d fore wing; e mesonotum and scutellum; f head, dorsal view; g head, frontal view; h hind wing. Scale line = 0.5 mm.

FIGURE 35. Distribution map of laevigata-group of Dolichogenidea species in China.*: Dolichogenidea aberrantenna Liu & Chen, sp. n.; ■: Dolichogenidea aegeriphagous Liu & Chen, sp. n.; Δ: Dolichogenidea ancylotergita Liu & Chen, sp. n.; •: Dolichogenidea anteruga Liu & Chen, sp. n.; ♥: Dolichogenidea biconcava Liu & Chen, sp. n.;•: Dolichogenidea brevifacialis Liu & Chen, sp. n.; Ŧ: Dolichogenidea breviventris (Ratzeburg, 1848).