Dolichogenidea indicaphagous 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 : 31-32

Dolichogenidea indicaphagous Liu & Chen , sp. n.

Figures 14 , 36

Description. Female. Body length 2.6 mm, fore wing length 2.9 mm.

Head. Rather transverse in dorsal view, 2.1× as wide as long and as wide as mesoscutum. Temple shiny and nearly impunctate, slightly constricted. Face rather transverse, 0.6× as high as wide, smooth, very shiny, and impunctate, inner margin of eyes parallel. Ocelli on low triangle, the posterior tangent to the anterior ocellus slightly cutting the posterior pair, distance between fore and a hind ocellus shorter than diameter of an ocellus, POL:OD:OOL=5.0:2.0:4.0. Antenna shorter than body (2.2:2.6), penultimate antennomere cubic.

Mesosoma. Length:breadth:height=44.5:27.0:30.0. Disc of mesonotum shiny, with deep, punctures, interspaces not larger than diameter of punctures but it sparser posteriorly. Scutellar sulcus straight, relatively broad with carinae in between. Scutellum polished, smooth without punctuation. Propodeum shiny, with sparse fine punctures anteriorly, strongly shiny and polished posteriorly except short U-shaped carina around orifice, indistinctly depressed medially. Mesopleuron highly polished, with shallow and sparse punctures anteriorly.

Legs. Spines on outer side of hind tibia dispersed. Inner spur of hind tibia a little longer than outer spur, 2/5 length of basitarsus. Basitarsus of hind leg almost as long as tarsomeres 2–4 combined.

Wings. Pterostigma 2.5× as long as its widest part. Vein 1-R1 (Metacarp) as long as pterostigma, 5.0× as long as its distance from the apex of the marginal cell. Vein r arising from middle of pterostigma, slightly shorter than width of pterostigma, vein r as long as vein 2-SR, distinctly angled at their meeting, vein 2-M half length of vein 2- SR. 1 st discal cell nearly 1.2× wider than high. 1 st submarginal cell of hind wing only a little wider than high (subquadrate). Vein cu-a nearly straight and perpendicular to vein 1-1A, vannal lobe beyond its widest part more or less straight with minute hairs.

Metasoma. Almost as long as mesosoma. T1 slightly widened posteriorly, 1.2× longer than hind width, basal two-fifth indistinctly concave and polished, turned-over part polished, shiny with very shallow sparse punctures. T2 straight apically, 4× wider than long in the middle. T3 1.4× as long as T2 (7.0:5.0), tergites after T1 highly polished, and shiny. Ovipositor sheath slightly longer than hind tibia (36.5:32.5), indistinctly expanded apically, a little wide wholly.

Colour. Head and mesosoma black, but metasoma obviously bright reddish yellow. Palpi, tegula and spurs pale yellow. Antenna gradually changed from yellow (pedicel and scape) to yellowish brown (basal five joint of flagellum) to brown (the last joints). Ovipositor sheath evenly dark brown. Labrum and mandible light reddish yellow. Legs as metasoma, except hind coxa dark brown and apical third of hind tibia with tarsus more or less fumous. Wing membrane hyaline, vein 1-R1 and vein C+SC+R yellowish brown, pterostigma brownish, r, 2-SR, 2- M and other veins pale yellow, pterostigma with pale basal spot.

Variation. Tergites of some specimens darker at base (middle of T1) and hind (middle of last 3–4 tergites).

Male. Similar to female, except: tergites darker especially at base (middle of T1) and hind (middle of last 3–4 tergites); T1 slightly longer; and basal nine joints of antenna almost of long even size (nearly 3× longer than wide) (the rest lost), while female obviously gradually shorter.

Host. According to the label: Lamprosema indicata (Fabricius) ( Lepidoptera : Pyralidae ).

Material examined. Holotype: ♀, Ganzhou , Jiangxi, 1983. IX.6, Qiu Kefeng, No. 840203, host: Lamprosema indicata (Fabricius) . Paratypes: 11♀♀, Ganzhou , Jiangxi, 1983. IX.6, Qiu Kefeng, No. 840203, host: Lamprosema indicata (Fabricius) ; 1♂, Ganzhou , Jiangxi, 1983. IX.6, Qiu Kefeng, No. 840203, host: Lamprosema indicata (Fabricius) ; 2♀♀, Ganzhou , Jiangxi, 1983. VI.28, Qiu Kefeng, No. 840200, host: Lamprosema indicata (Fabricius) ; 7♀♀ 4♂♂, Ganzhou , Jiangxi, 1983. VI.28, Qiu Kefeng, No. 840181, host: Lamprosema indicata (Fabricius) ; 1♀, Sanya , Hainan, 2008. XI.20, Tan Jiangli, No. 200805234 ; 1♀, Mt. Nankun, Longmen , Guangdong, 2003. VII.23, Xu Zaifu, No. 20053877 ; 1♀, Huatan, Yangchun, Guangdong, 2002. V.3–4, Xu Zaifu, No. 20027561 ; 1♀, Mt. Wuzhi , Hainan, 2007. X.29, Liu Jingxian, No. 200710206 ; 1♀, Fuzhou , Fujian, 1991. IV.17, Liu Changming, No. 966554 ; 1♀, Fuzhou (Shenzhoushumuyu), Fujian, 1989.X, Wu Zhishan, No. 20009703 ; 2♀♀, Datianding, Dawuling , Guangdong, 2001. X.3, Xu Zaifu, Nos. 20020633, 20020498 ; 1♀, Panlongxia, Deqing , Guangdong, 2003. X.4, Xu Zaifu, No. 20054920 ; 1♀, Nanning , Guangxi, 2002. X.30, Lin Naiquan, No. 20035906 ; 1♀, Hangzhou , Zhejiang, 1957. XI.10, Hu Cui, No. 5687.3 ; 1♀, Hangzhou , Zhejiang, 1935. X.3, Xu Zaifu, No. 1036.

Distribution. China (Fujian, Guangdong, Guangxi, Hainan, Jiangxi, Zhejiang).

Etymology. The specific name “ indicaphagous ”, referring to that it is a parasitoid of larva of Lamprosema indicata (Fabricius) .

Remarks. This species is similar to D. flavigastrula Chen et Song by an obvious yellow metasoma but differs from the latter by the following: T1 almost polished all over (the latter strigose or striate and with medial groove); ocelli on low triangle (the latter high triangle); and vannal lobe beyond its widest part more or less straight (the latter evenly convex).

Figures

FIGURE 14. Dolichogenidea indicaphagous Liu & Chen, sp. n. a habitus, lateral view; b fore wing; c hind wing; d mesonotum and scutellum; e metasoma, dorsal view; f propodeum; g head, frontal view; h head, dorsal 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.