Scambus incanus Gómez, 2015

Gómez, Isrrael C. & Yabar-Landa, Erick, 2015, Description of the first species of Scambus Hartig (Hymenoptera, Ichneumonidae) from Peru, with a key to the Neotropical species, Zootaxa 3956 (3), pp. 437-443 : 441-442

Scambus incanus Gómez sp. n.

( Figs 2 a, 2b, 2c, 2d)

Type locality. Peru, Department of Cusco.

Type material. Holotype Female (UNSAAC). Peru, Dept. of Cusco, Kantu, 3417 m, A. Graveros leg. Hand net, 8.III.2011. Paratype Female (UNSAAC). Peru, Dept. of Cusco, Kantu, 3417 m, A. Graveros leg. Hand net, 8.III.2011.

Description. Female ( Fig. 2 a). Body length about 7 mm. Mandible subequally bidentate; malar space about 0,5 × as long as basal mandibular width; lower face broad, about 1.5 × as broad as medially high, rather flat, highly polished and sparsely punctate ( Fig. 2 b). Head in dorsal view with gena long, evenly narrowed behind eyes, occipital carina complete, slightly dipped dorsally; lateral ocellus separated from eye by about 1.5 × its own maximum diameter. Antenna with 21 flagellomeres. Pronotum with epomia present. Mesoscutum convex, smooth with setiferous punctures mainly anteriorly. Submetapleural carina absent ( Fig. 2 c). Propodeum in profile slightly declivous, posteriorly evenly rounded, dorsally smooth, with lateromedian longitudinal carina present only on extreme posterior margin as weak swellings; pleural carina present but weak, propodeal spiracle circular.

Fore wing length about 6 mm; cu-a opposite base of Rs & M; hind wing with distal abscissa of Cu1 present joining cu-a closer to 1A than to M. Metasoma moderately stout ( Fig. 2 d); tergite I about 1.0 × as long as posteriorly broad, with lateromedian carinae present anteriorly, converging towards centre of tergite, then evanescent; lateral longitudinal carina present posteriorly; tergite II about 0.9 × as long as broad, punctate centrally; tergite III about 0.8 × as long as broad, weakly punctate, following tergites similar though progressively more closely and shallowly punctate ( Fig. 2 d). Ovipositor with 10 teeth; ovipositor sheath about 2.8 × length of hind tibia, with long black pubescence.

Black insects, palpi whitish, antenna dark brown. Pronotum with white band on anterior edge and apical corner; tegula white. Ovipositor sheath brown. Fore and mid coxae whitish, hind coxa black; fore and mid trochanters whitish, hind trochanters whitish ventrally black; fore and mid femora whitish, hind femur white with brown dorsally except basally, hind tibia white dorsally, ventrally weak brown apically; trochanters whitish apically with weak brown. Wings hyaline; pterostigma light brown.

Male. unknown

Diagnosis. Scambus incanus sp. n. can be distinguished from all other Neotropical species of the genus by the combination of the following characters: 1) ovipositor about 2,8 × as long as hind tibia, 2) submetaplural carina absent, and 3) head, mesosoma and metasoma black. This new species is similar to Scambus zunigai , however, it can be distinguished because the latter has the antennal flagellum with about 23 segments and a shorter ovipositor (about 2.1 × as long as hind tibia).

Biology. Nothing is known about the biology of this species.

Etymology. The species name refers to the Inca Empire, the capital of which was located in the Peruvian region of Cusco.

Distribution. This species is, to date, only known from the Cusco region in the Peruvian Andes.

Figures

FIGURE 2. Scambus incanus sp. n. a) habitus, b) face, c) mesosoma, and d) metasoma.