Erromenus marginatus, Provancher, 1883

Kasparyan, D. R., 2020, Two new species of the genus Erromenus Holmgren, 1857 (Hymenoptera: Ichneumonidae: Tryphoninae) from the Siberia and Russian Far East, Far Eastern Entomologist 419, pp. 1-8 : 7-8

Key to East Palaearctic black-colored species of Erromenus marginatus group

1. Upper edge of antennal sockets strongly projecting as a flange (0.25-0.5 times as high as the scape is wide). Terga 2 and 3 polished with distinct punctures. Clypeal foveae large, laterally touching or almost touching to compound eye. Antenna usually with 26–31 flagellomeres. Subgroup zonarius ..................................................................................... 2

– Upper edge of antennal sockets not raised or hardly projecting (0.1 times as high as the scape is wide). Terga 2 and 3 mat, scabrous (with irregular rugosity) and with indistinct punctures. Clypeal foveae moderately large, laterally separated from the eye by about the length of the cheek (malar space). Antenna with 20–26 flagellomeres. Legs, except black coxae and trochanters, usually reddish ...................................... E. punctulatus Holmgren

2. Areola beyond the costulae semicircular and rather short, about 0.33 times as long as wide ( Fig. 3 ). Hind tibia completely blackish, without small basal yellow spot; middle and hind legs completely black ( Fig. 1 ). Clypeal foveae large, deep, but not extending to malar space. Oral carina slightly higher than occipital carina, 0.5 times as long as basal width of mandible ..................................................................................... E. atrator sp. n.

– Areola beyond the costulae 0.5-0.6 times as long as wide with its lateral sides directly narrowed to the apical area ( Fig. 7 ). Hind tibia yellowish rufous or brownish black and always with a basal yellow spot; middle legs beyond trochanters yellowish rufous ( Fig. 5 ) or occasionally completely black. Clypeal foveae large, deep, extending laterally to malar space ..…........................................................................................................…….. 3

3. Oral carina projecting as moderately high lobe, 2 times as long as high, and 0.4 times as long as the basal width of mandible. Upper margin of antennal socket raised as a flange about 0.3 times as high as scape width. Metasoma black with apical half of tergite 5 and terga 6–8 entirely rufous ( Figs 5, 8 ). Tegulae blackish brown. In holotype antenna with 26 flagellomeres; fore wing 5.9 mm .................................................... E. tereshkini sp. n.

– Oral carina slightly higher than occipital carina, 0.5 times as long as basal width of mandible. Upper margin of antennal socket raised as a flange about 0.35-0.50 times as high as scape width. Tegulae blackish with antero-lateral margin usually whitish. Antenna with 26–31 flagellomeres; fore wing 4.2–6.5 mm ....................... E. zonarius Gravenhorst

Figures

Figs 1–4. Erromenus atrator sp. n., ♀, holotype: 1 – habitus, lateral view; 2 – head, frontal

Figs. 5–8. Erromenus tereshkini sp. n., ♀, holotype: 5 – habitus, lateral view; 6 – head,