Ichneumon cessator MÜLLER, 1776

Riedel, Matthias, 2018, Contribution to the Siberian species of Ichneumon LINNAEUS (Hymenoptera, Ichneumonidae, Ichneumoninae), Linzer biologische Beiträge 50 (2), pp. 1509-1562 : 1514-1515

Ichneumon cessator MÜLLER, 1776

syn. nov. Ichneumon jakovlevi KOKUJEV, 1904: 81

M a t e r i a l e x a m i n e d: East Siberia, Irkutsk region, Shelehov environment, 1♀ 2.viii.2005, leg. A. Shavrin (coll. Riedel).

D e s c r i p t i o n: Body length 14.5 mm. Antenna with 43 flagellomeres, bristleshaped; 1 st flagellomere 3.3x longer than wide, c.14 th flagellomere square, widest flagellomeres 0.87x as long as wide, preapical flagellomere 1.15x longer than wide. Malar space 0.7x as long as 1 st flagellomere. Area superomedia 0.75x as long as wide, widest apically. Hind femur 4.4x longer than wide, with scattered punctures in ventral 1/5.

Color: Black. Antenna with diffuse reddish-yellow ring on flagellomeres 8-12. Scutellum and stripes on 6 th and 7 th tergites cream-yellow. Coxae, trochanters and fore and mid trochantelli black; legs otherwise red; hind tibia infuscate in apical 1/3; hind tarsus blackish. Pterostigma reddish.

T a x o n o m i c a l r e m a r k The available specimen is structurally similar to European material of Ichneumon cessator MÜLLER. It differs only by the completely yellow scutellum. I have not seen the type of Ichneumon jakovlevi KOKUJEV , but from the description given by RASNITSYN (1984: 794) who reported the slender basal flagellomere, this var. of I. cessator seems to be conspecific with Ichneumon jakovlevi KOKUJEV which had also been found in the Irkutsk area.

D i s t r i b u t i o n: Palaearctic region, known from Siberia ( KOKUJEV 1904, MEYER 1933).