Homotropus formosus, Klopfstein, Seraina, 2014

Klopfstein, Seraina, 2014, Review of the Diplazontinae (Hymenoptera, Ichneumonidae) of the Kuril islands, with descriptions of two new species, Zootaxa 3779 (1) : -

Homotropus formosus sp. n.

( Fig. 3 )

This species belongs to the pictus species group (according to Dasch, 1964a). Its black coxae and large size in combination with a strongly coriaceous and matt mesosoma distinguish it from most species there-in. In terms of size, it could be confused with Homotropus megaspis Thomson and H. momoi (Uchida) ; from the former, it differs by the dark coxae, and from both by the coriaceous sculpture of the mesosoma. The otherwise similar Homotropus areolaris (Uchida) differs by the coloration of the stigma in the fore wing, the coloration of the fore and mid coxae, and the more extensive coriaceous sculpture.

Etymology. The name “ formosus ” is intended to reflect the overall appearance of the species.

Description. Fore wing length 5.1–5.5 mm (5.1 in holotype) in females, 5.8 mm in the male. Antenna with 21– 22 (21) flagellomeres in females, apical flagellomeres with multiporous plate sensilla sparse but also present ventrally; 23 flagellomeres in males, with narrow, long tyloids on flagellomeres 7 to 15. Face strongly coriaceous and matt, distinctly punctate, especially centrally, without vertical impressions. Clypeus with apical margin thin, strongly impressed, resulting in the central area being convex.

Pronotum and propleuron with strong and dense punctures, smooth or finely coriaceous in-between. Mesoscutum without notauli; finely coriaceous and matt in the females, less coriaceous and mostly shining in the male, in both sexes with dense punctures on whole surface. Mesopleuron with epicnemical carina strong and complete ventrally; strongly coriaceous and matt with dense punctures except for small smooth area around the speculum in females, in the male matt only on lower half, more shining on upper half between the punctures. Scutellum only carinate at base, rather strongly convex, smooth between the strong punctures. Metapleuron with dense punctures, but also some smooth areas. Propodeum only with metapleural carina and hind part of the lateral longitudinal carinae present, densely and rugulously punctate near the base, more rugose and partly smooth on petiolar area; propodeal spiracle not enlarged.

Fore wing areolet sometimes large, almost rhombic, vein 3rs-m mostly well pigmented; hind wing with 2–3 basal hamuli. Legs including coxae coriaceous and matt, hind tibia with thickened, scale-like hairs on outer surface.

Female metasoma dorsoventrally depressed, tapered towards the apex, apical margins of the tergites straight or convex, without transverse impressions. First tergite 1.1–1.3 (1.1) times as long as wide, with median dorsal carinae only present on about basal fourth, finely coriaceous and matt; second tergite 0.6–0.7 times as long as wide, basally with some strong longitudinal wrinkles, finely coriaceous and matt and with a few, very sparse and weak punctures; second tergite 0.8–0.9 times length of first tergite; spiracle of second and third tergites on dorsal part, above lateral fold. Ovipositor sheaths about 0.3 times as long as hind tibia, more or less parallel-sided and truncate close to the tip, smooth and shining and with some setae close to the tip.

Coloration of females. Antenna black. Head and mesosoma black, with small yellow or orange central face patch, yellow on clypeus, mouthparts, hind corner of pronotum, tegula, subtegular ridge, large shoulder mark, and upper mesepimeron; scutellum entirely black. Fore wing with stigma lighter at base. Legs orange, all coxae black, fore coxa apically with some yellow, trochanters basally black, apically yellow, trochantelli yellow, femora orange, hind tibia white with apex, base and a small subbasal spot dark, hind tarsus dark. Metasoma entirely black.

Coloration of males. As in females but additionally with yellow over entire face, scape, pedicel and flagellomeres ventrally, propleuron, mesosternum, mesopleuron in front of epicnemical carina and with a spot on apical lower corner; fore and mid coxae entirely and hind coxa apically yellow, hind femur with dark marks at base and yellow at tip.

Type material. Holotype ♀: Russia, Kuril islands: Urup Island, Inland from Aleutka Bay. N45°56.18' / E150°09.39', 0 7. VIII. 2000. leg. D.J. Bennett. Paratypes: one ♀, same data as holotype; one ♂: Japan, Hokkaido, Mt. Yuubari, Yuubari city. 0 1. VII. 1995. leg. Ito Gen.

Figures

FIGURE 3. Habitus of the female holotype (A) and male paratype (B) of Homotropus formosus sp. n.