Dolichogenidea flexisulcus Liu & Chen, 2019

Liu, Zhen, He, Jun-Hua, Chen, Xue-Xin, Gupta, Ankita & Moghaddam, Mostafa Ghafouri, 2019, The ultor - group of the genus Dolichogenidea Viereck (Hymenoptera, Braconidae, Microgastrinae) from China with the descriptions of thirty-nine new species, Zootaxa 4710 (1), pp. 1-134 : 50

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Dolichogenidea flexisulcus Liu & Chen

sp. nov.

Dolichogenidea flexisulcus Liu & Chen , sp. nov.

( Figs 22 View FIGURE 22 , 67 View FIGURE 67. 21–35 )

Description. Holotype. Female. Body length 2.0 mm, fore wing length 2.3 mm.

Head. Transverse in dorsal view, 1.9× as wide as long, as wide as mesoscutum ( Fig. 22f View FIGURE 22 ). Temple shiny with shallow punctures, weakly constricted behind eyes from dorsal view. Face ( Fig. 22d View FIGURE 22 ) transverse, 0.8× as high as wide, shiny, with shallow punctures, inner margins of eyes distinctly, but not strongly, constricted posteriorly. Ocelli small, posterior tangent to anterior ocellus virtually touching posterior pair of ocelli, distance between fore and a hind ocellus a little longer than diameter of an hind ocellus, POL:OD:OOL = 3.0:1.5:4.0. Antenna weakly longer than body length, penultimate antennomere 1.7× longer than wide.

Mesosoma. Length:width:height = 35.0:22.0:25.0. Disc of mesonotum ( Fig. 22h View FIGURE 22 ) shiny, with large, dense punctures. Scutellar sulcus strongly curved, narrow with carinae inbetween. Scutellum shiny, with sharp, relatively dense punctures. Propodeum ( Fig. 22e View FIGURE 22 ) shiny, with well-defined areolation which opened at anterior end, three posterior fields highly shiny and polished, with hairy shallow punctures anterio-laterally. Mesopleuron highly polished, anterior part sharply, sparsely punctate.

Legs. Hind coxa shiny, with shallow punctures. Spines on outer side of hind tibia acuminated, dispersed. Inner spur of hind tibia 2/5 length of hind basitarsus, outer spur 1/3 length of hind basitarsus. Basitarsus of hind leg a little shorter than tarsomeres 2–4 (12.0:14.0).

Wings. Pterostigma 2.3× as long as its widest part ( Fig. 22b View FIGURE 22 ). Vein 1-R1 1.3× longer than pterostigma, 5.5× as long as its distance from apex of marginal cell. Vein r arising from apex of pterostigma, perpendicular to the latter, and 0.7× as long as width of it, r as long as to weakly longer than 2-SR, angled at meeting, 2-M half length of 2-SR and weakly longer than 1-SR and shorter than 2-SR+M, m-cu slightly longer than r. First discal cell of fore wing 1.2× wider than high. Second discal cell of hind wing 1.8× wider than high. Vein cu-a strongly curved ( Fig. 22c View FIGURE 22 ).

Metasoma. As long as mesosoma. T1 ( Fig. 22g View FIGURE 22 ) weakly widened towards apex, indistinctly constricted posteriorly, 1.3× longer than hind width, basal 1/3 indistinctly concave, rugulose, turned-over part quadrate, uneven with distinct rugae. T2 weakly striate, 3× wider than long in middle, weakly curved apically. T3 nearly 1.4× longer than T2. Tergites posterior to T2 polished, shiny, and densely pubescent. Hypopygium distinctly shorter than apex of metasoma. Ovipositor sheath 0.9× as long as hind femur, thin and parallel-sided.

Colour. Black ( Fig. 22a View FIGURE 22 ). Tegula brown. Palpi and spurs whitish. Antenna yellowish brown. Ovipositor sheath brown. Labrum reddish brown and mandible reddish yellow. Fore leg, posterior half of mid femur, mid tarsus, apex of hind femur and basal half of hind tibia yellow, other parts infuscate to dark brown. Wing membrane hyaline, vein 1-R1, pterostigma and apical C+SC+R yellowish brown, basal C+SC+R, r, 2-SR, and 2-M whitish yellow, and other alar veins colourless, pterostigma without whitish basal spot.

Variation. Body length 2.0– 2.5 mm, fore wing length 2.3–2.6 mm. T2 of specimens from Jiangsu slightly uneven with sparse punctures.

Male. Body length 1.9–2.0 mm, fore wing length 2.1–2.3 mm. Similar to female, except: pterostigma whitish with dark border and penultimate antennomere 2.3× longer than wide.

Material examined ( ZJUH). Holotype: ♀, Songyang , Zhejiang, 1989.VI.16, He Junhua, ex a larva of Zygaenidae, No. 893623 . Paratypes: 17 ♀♀ 13 ♂♂, same data as holotype ; 4 ♀♀ 1 ♂, Guangzhou , Guangdong, 1982.VII, He Junhua, No. 893623 ; 3♀♀ 1 ♂, Nanjing, Jiangsu, Peng Quxian , ex Scopelodes contracta Walker, No. 824925 .

Distribution. Eastern Palaearctic [ China: Jiangsu]; Oriental [ China: Guangdong, Zhejiang].

Etymology. The specific name “ flexisulcus ” derived from the Latin “flexus” and “sulcus”, referring to scutellar sulcus strongly curved.

Remarks. This species is similar to D. multicolor Liu & Chen , sp. nov., but differs in the following: pterostigma large, 2.3× as long as its widest part (the latter small, 3.0×); temple weakly constricted behind eyes from dorsal view (the latter strongly constricted); and metasoma as long as mesosoma (the latter distinctly shorter).