Cymodusa melana Sheng, Li & Sun, 2021

Li, Tao, Chang, Guo-Bin, Yang, Zai-Hua, Sun, Shu-Ping, Tian, Yue & Sheng, Mao-Ling, 2021, Two new species of Cymodusa Holmgren (Hymenoptera, Ichneumonidae) with a key to species known from China and Oriental region, Journal of Hymenoptera Research 88, pp. 103-114 : 103

Cymodusa melana Sheng, Li & Sun sp.nov.

Figures 10-14 , 15-20

Diagnosis.

Dorsal median portion of occipital carina (Fig. 14 ) angled. Anterior tentorial pit distinct, against eye. Postocellar line approximately 1.2 × as long as ocular-ocellar line. Lateral carinae of area basalis almost parallel, 1.2-1.3 × as long as wide. Lateromedian longitudinal carinae distinctly angled in level of posterior transverse carina. Tergites 2 (Fig. 19 ) elongate, 1.7-1.8 × as long as posterior width. Posteromedian portions of tergites 6-7 (Fig. 20 ) distinctly concave. Head, mesosoma, all metasomal tergites and hind leg almost entirely black.

Description.

Body length 7.0-7.5 mm. Fore wing length 3.5-4.0 mm. Ovipositor sheath 1.2-1.5 mm.

Head. Eye with weak, short setae, inner margins (Fig. 11 ) distinctly concave near antennal sockets. Face and clypeus roughly shagreened. Face strongly convergent ventrally, maximum width beneath antennal socket approximately 1.8 × as long as minimum width, dorsal margin concave medially. Clypeus with dense fine punctures, evenly convex, apical margin evenly convex forward. Anterior tentorial pit small, distinct, against eye. Mandible with dense yellowish white setae and sparse fine punctures; lower tooth almost as long as upper tooth. Malar space about 0.1 × as long as basal width of mandible. Gena (Figs 12 , 13 , 14 ) shagreened, lower portion with dense delicate yellowish white setae, upper portion strongly convergent backward. Vertex finely shagreened, posterior portion behind hind margin of stemmaticum steeply oblique. Postocellar line approximately 1.2 × as long as ocular-ocellar line. Frons almost flat, shagreened, median portion with fine indistinct transverse wrinkles. Antenna with 32 flagellomeres; ratio of length from first to fifth flagellomeres: 2.0:1.3:1.2:1.2:1.1. Occipital carina (Fig. 14 ) complete, dorsal median portion angulated.

Mesosoma. Lateral concavity of pronotum (Figs 13 , 16 ) with dense strong oblique wrinkles; dorsoposterior portion roughly shagreened. Epomia long and strong. Mesoscutum (Fig. 15 ) evenly convex, with leathery texture, lateral portion with fine distinct punctures, distance between punctures 0.2-1.5 × as long as one diameter of puncture; posterior portion with short indistinct transverse wrinkles. Notaulus indistinct. Scuto-scutellar groove with 6-7 distinct longitudinal carinae. Scutellum finely shagreened, basal 0.25 with lateral carina. Postscutellum transversely convex, anterior portion depressed transversely, anterolateral with small pit. Lower half of mesopleuron (Fig. 16 ) slightly convex; median portion in front of speculum with distinct oblique wrinkles; beneath subtegular ridge with short indistinct transverse wrinkles. Speculum almost smooth, shining. Epicnemial carina strong, upper end almost reaching front edge of mesopleuron, about 0.7 distance to subtegular ridge. Metapleuron evenly convex, with dense grayish white setae; juxtacoxal carina absent; submetapleural carina complete. Hind femur 5.7-6.0 × as long as its maximum width. Ratio of length of hind tarsomeres from first to fifth: 5.5:2.7:1.7:1.0:1.0. First tarsomere 2.4 × as long as length of longer spur. Claw small, pectinate basally. Wings slightly brownish, hyaline. Fore wing with vein 1cu-a slightly basal of M&RS. Areolet sessile, receiving vein 2m-cu approximately at middle, 2rs-m approximately as long as 3rs-m; postnervulus intercepted at middle. Hind wing with basal portion of M+CU distinctly arched; nervellus almost vertical, intercepted at lower 0.25; final abscissa of CU unpigmented. Propodeum (Fig. 17 ) roughly shagreened, lateral portion with dense gray setae; lateromedian longitudinal carinae strong, distinctly angled in level of posterior transverse carina; area basalis separated from area superomedia by weak carina, lateral sides slightly convergent anteriorly or parallel, 1.6-1.7 × as long as anterior width, 1.2-1.3 × as long as posterior width; areas superomedia slightly wider than long; areas superomedia and petiolaris completely confluent, with short, indistinct transverse wrinkles; costula present. Propodeal spiracle small, circular.

Metasoma. First tergite (Fig. 18 ) 3.2 × as long as apical width; petiole smooth, shiny, lateral side slightly longitudinally concave; postpetiole (Fig. 19 ) distinctly convex, shagreened; spiracle small, weakly convex, located approximately at apical 0.35. Tergites 2 (Fig. 19 ) with texture as postpetiole, elongate, slightly evenly widened posteriorly, 1.7-1.8 × as long as posterior width. Tergite 3 with parallel sides, 1.3 × as long as posterior width. Fourth and subsequent tergites compressed. Posteromedian portions of tergites 6-7 (Fig. 20 ) distinctly concave. Ovipositor sheath 1.2 × as long as hind tibia. Apical portion of ovipositor weakly compressed, with sharp dorsal notch.

Coloration (Fig. 10 ). Black, except for the following: ventral profile of base of antenna reddish brown. Mandible except teeth, maxillary palpi, labial palpi yellow. Tegula, fore and middle legs reddish brown, except coxae black and ventral profiles of trochanters darkish brown. Hind trochantellus yellow. Base of hind femur reddish brown. Pterostigma and veins blackish brown.

Etymology.

The specific name is derived from the body and hind leg almost entirely black.

Material examined.

Holotype: China • ♀; Guizhou, Lengjiaba, 840 m, Fanjingshan National Natural Reserve, Jiangkou ; 24.VI.2019; IT by Zhen-Hai Yang . Paratypes: China • 1♀; same data as for holotype. • 1♀; same data as for holotype except 23.IX.2019 . China • 2♀♀; Guizhou, Panlongshan , 1179 m, Wudang, Guiyang; 24.VI.2019 ; IT by Zai-Hua Yang.

Distribution.

China.

Differential diagnosis.

The new species is similar to C. taprobanica (Cameron, 1905), but can be distinguished from the latter by the following combination of characters: areolet sessile; area basalis of propodeum at most 1.7 × as long as maximum width; area superomedia wider than length; hind leg almost entirely black. Cymodusa taprobanica (Cameron): areolet petiolate; area basalis of propodeum about 3.0 × as long as wide; area superomedia longer than width; hind leg partly black.

Figures

Figures 10 - 14. Cymodusa melana Sheng, Li & Sun, sp. nov. Holotype. Female 10 habitus, lateral view 11 head, anterior view 12 head, dorsal view 13 head and pronotum, lateral view 14 head, dorsoposterior view.

Figures 15 - 20. Cymodusa melana Sheng, Li & Sun, sp. nov. Holotype. Female 15 mesoscutum and scutellum, dorsal view 16 mesosoma, lateral view 17 propodeum, dorsal view 18 first tergite, lateral view 19 postpetiole and tergite 2, dorsal view 20 (Paratype) Posterior portion of metasoma, dorsal view.