Homotropus nigritarsus ( Gravenhorst 1829, Bassus

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 69-70

Homotropus nigritarsus ( Gravenhorst 1829, Bassus )

Bassus picitans Desvignes 1862

Bassus groenlandicus Holmgren 1872

Diagnosis. Fore wing length 3.3–5.1 mm. Antenna of both sexes with 19 to 20 flagellomeres, in females apical flagellomeres with multiporous plate sensilla also present ventrally; in males with narrow, long tyloids on flagellomeres 7 to 14/15. Face strongly coriaceous and punctate over entire area. Clypeus rather weakly excised, with lobes rounded. Mesopleuron smooth and shining, at most with very restricted coriaceous areas on lower half, strongly punctate over at least half the surface. Mesoscutum smooth and shining, strongly punctate. Hind coxa with hind surface smooth and shining between seta roots, coriaceous only basally. Fore wing areolet closed, vein 3rs-m usually unpigmented. Propodeum with only pleural carina and apical parts of longitudinal carinae present but with some rugae on petiolar area which partly indicate the location of the petiolar carinae, coriaceous, rugose on petiolar area. Female metasoma gradually tapered posterior to third segment. First tergite without median dorsal carinae, without longitudinal wrinkles, 1.0–1.4 times as long as wide; second tergite basally with few very short longitudinal wrinkles, 0.5–0.7 times as long as wide in females, 0.6–0.8 in males, second tergite 0.8–1.0 times as long as first tergite; spiracle of third tergite on dorsal part, above lateral fold.

Colouration of females. Antenna black. Head and mesosoma black, with yellow usually on small central face patch which is separated from yellow on clypeus, yellow on mouthparts, hind corner of pronotum, tegula, subtegular ridge, often large shoulder mark, mesepimeron, scutellum at most with small apical spot. Legs orange, all coxae black, fore and mid coxae often with yellow apex; femora orange, hind tibia orange with apex dark, hind tarsus dark. Metasoma black.

Colouration of males. As in females but additionally with yellow along inner orbits and central face patch, sometimes over entire face, scape and pedicel ventrally, sometimes parts of epicnemium, fore and mid coxae and sometimes hind coxa apically, and often basal spots on tergites 3 and 4.

Material examined. Lectotype of Bassus picitans Desvignes : United Kingdom. 1♂, at BMNH.

New for Ukraine: SE, Lugansk reg, Provalie, leg. Osipov, 19.–21.VII.2004. 1♀, at MR.

Bulgaria (1), Finland (1), France (3), Germany (1), Hungary (2), Netherlands (1), Norway (1), Russia (2), Spain (1), Sweden (90), Switzerland (90), Turkey (1), Ukraine (1), United Kingdom (30).

Distribution. Holarctic and Neotropical.

Figures. Male terminal sternite and tergites ( Figs 10 C, 10D), antenna ♂ ( Fig. 13 H), habitus ( Fig. 31 E).

Figures

FIGURE 10. Terminal sternites and tergites of male representatives of the three genus groups of Diplazontinae. A, C, E: twelfth sternite. B, D, F: ninth and tenth tergites, which can be fused to form a syntergum (B, F), or present as separate sclerites (D). A, B: Sussaba aciculata of the Sussaba genus group. C, D: Homotropus nigritarsus of the Syrphoctonus genus group. E, F: Diplazon flixi of the Diplazon genus group.

FIGURE 31. Habitus of Homotropus species. A. Homotropus dimidiatus. B. Homotropus elegans. C. Homotropus frontorius. D. Homotropus longiventris. E. Homotropus nigritarsus. F. Homotropus pallipes.

FIGURE 13. A. Diplazon multicolor ♀, metasoma. B. Diplazon pectoratorius ♀, propodeum. C. Tymmophorus obscuripes ♀, propodeum. D. Xestopelta gracillima ♀, mesoscutum showing colour pattern. E. Campocraspedon caudatus ♀, metasoma. F. Campocraspedon caudatus ♂, metasoma. G. Daschia brevitarsis ♀, metasoma. H. Homotropus nigritarsus ♂, antenna. I. Enizemum ornatum ♂, antenna.