Fossatyloides gracilentus ( Holmgren 1858, Bassus

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 57-58

Fossatyloides gracilentus ( Holmgren 1858, Bassus )

Bassus pulcher Holmgren 1858

Homotropus fossatus Dasch 1964a

Homotropus fossatus aureopectus Dasch 1964a

Diagnosis. Fore wing length 4.4–4.9 mm. Antenna of both sexes with 20–21 flagellomeres, apical flagellomeres with multiporous plate sensilla also present ventrally. Face strongly coriaceous, punctures disappearing against the background sculpture. Clypeus very weakly excised, with lobes rounded. Mesopleuron with both smooth areas and irregular coriaceous sculpture, especially on lower half, and very weak punctures. Mesoscutum partly smooth and shining with punctures indistinct but with some finely coriaceous areas, often in two parallel lines in place of the notauli. Hind coxa with hind surface entirely coriaceous and matt. Fore wing areolet closed, vein 3rs-m pigmented or unpigmented. Propodeum with pleural carina present, lateral longitudinal carina present but sometimes interrupted, pleural area enclosed by a clear carina which is sometimes interrupted, and with multiple carinulae parallel to it; finely coriaceous, at most with some rugae in petiolar area; with or without enclosed basal area. Female metasoma gradually tapered behind third segment. First tergite without median dorsal carinae but with some longitudinal wrinkles in place, 1.5–1.8 times longer than wide; second tergite basally with some weak longitudinal wrinkles, 0.7–0.8 times as long as wide in females, 0.8–0.95 in males, second tergite 0.6–0.85 times as long as first tergite; spiracle of third tergite on the dorsal part, above lateral fold.

Colouration of females. Antenna dark brown, sometimes paler below. Head and mesosoma black, with or without yellow central face patch, yellow on clypeus and mouthparts, hind corner of pronotum, tegula, subtegular ridge, large shoulder mark, upper mesepimeron, and sometimes yellow line on lower mesopleuron; scutellum various, ranging from entirely black to only marked laterally or apically to being entirely bordered by yellow. Legs orange, coxae either black basally and hind coxa largely black, or fore and mid coxae yellow and hind coxa orange, femora orange, often marked with black below, hind tibia yellow to orange with a dark apex, hind tarsus dark. Metasoma variously marked with orange, in the extreme from hind part of second tergite to fifth tergite but often less; hind margins of tergites 3 to apex often light.

Colouration of males. As in females but with yellow ventrally on antenna, entire face, and mesosternum and lower half of mesopleuron. Coxae often entirely yellow. Metasoma with orange colour usually reduced to hind parts of tergites 3 and 4 which are marked with yellow basally.

Material examined. Lectotype of Bassus gracilentus Holmgren , hereby designated: Sweden, Lapland, leg. Boheman. 1♂, at NRM . Lectotype of Bassus pulcher Holmgren : hereby designated: Sweden, Lapland, leg. Boheman. 1♂, at NRM . Paratype of Homotropus fossatus fossatus Dasch : USA, N.H., Randolph, leg. J.Peck & M.Townes, 2.VII.1946. 1♀, at BMNH.

Additional material. Canada, Ontario, Bruce Pen., Tobermory, leg. M.Riedel, 10.VIII.1994. 1♀, at ZSM. Finland, EH Lempäälä, Mäyhäniemi 680:32, leg. O.Sotavalta, 1963. 1♀, at NMBE . Sweden: Västerbotten, Vindelns kommun, Kubäckslidens försökspark, Kulbäcken meadow, birch wood on fine alluvial sediments, N64°11.413', E19°36.342', leg. SMTP, 01.IX.–22.IX.2003. 1♀, at NRM ; Lapland, leg. Boheman. 8♂, 5♀, at NRM. Switzerland, Grisons, Sur, SE Vauastg Dafora 1920m, N46°31.482, E9°38.755, leg. H.Baur, 21.–28.VII.2003. 1♂, at NMBE.

Distribution. Holarctic.

Figures. Antenna ♂ ( Fig. 14 K), propodeum ( Fig. 14 L), habitus ( Fig. 30 E).

Figures

FIGURE 30. Habitus of Diplazontinae species. A. Diplazon zetteli sp. nov. B. Enizemum ornatum. C. Episemura ensata. D. Eurytyloides umbrinus sp. nov. E. Fossatyloides gracilentus. F. Homotropus crassicornis.

FIGURE 14. A. Phthorima compressa ♀, metasoma. B. Enizemum ornatum ♀, hind tibia. C. Enizemum ornatum ♂, hind tibia. D. Homotropus frontorius ♀, hind tibia. E. Enizemum ornatum ♀, first tergite. F. Enizemum nigricorne ♀, first tergite. G. Homotropus elegans ♀, first tergite. H. Homotropus sundevalli ♀, first tergite. I. Enizemum ornatum ♀, clypeus. J. Homotropus elegans ♀, clypeus. K. Fossatyloides gracilentus ♂, antenna. L. Fossatyloides gracilentus ♀, propodeum. M. Homotropus pictus ♀, propodeum. N. Homotropus crassicornis ♀, propodeum.