Diplazon deletus ( Thomson 1890, Bassus

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 38-39

Diplazon deletus ( Thomson 1890, Bassus )

Diplazon rufigaster Dasch 1964a

Diagnosis. Fore wing length 3.8–4.9 mm. Antenna in females with 16–18, in males with 17–19 flagellomeres. Face with punctures disappearing against the coriaceous background. Mesopleuron smooth and polished weakly punctate largely restricted to lower half and front. Propodeum with a full set of carinae enclosing basal, lateral and petiolar areas. Tergite 1 1.2–1.45 times longer than wide in females, 1.4–1.7 in males, tergite 2 0.65–0.8 in females and 0.8–0.9 in males; tergites 2 and 3 strongly coriaceous and matt, on tergite 2 sometimes more rugose, punctures indistinct, smooth and shining behind transverse impressions. Transverse impressions deep on tergites 1 to 3. Metasoma dorsoventrally depressed or slightly tapered apically.

Colouration of females. Antenna dark brown, sometimes paler below. Head and mesosoma black, face with yellow along inner orbits, without yellow central face patch, yellow on clypeus and mouthparts, hind corner of pronotum, tegula, subtegular ridge, shoulder mark, upper mesepimeron; scutellum at least with yellow tip, sometimes largely yellow. Legs orange, coxae black with yellow apices, hind coxa entirely black; femora orange, sometimes marked with black basally; hind tibia black-white-black banded, sometimes apical band with an orange or orange-brown area, hind tarsus dark. Metasoma marked with orange at least behind transverse impressions on tergites 2 and 3, often also some orange on tergite 4.

Colouration of males. As in females but with yellow ventrally on scape and pedicel, entire face, front part of mesosternum, and sometimes lower mesopleuron. Fore and mid coxae usually entirely yellow.

Material examined. Lectotype of Bassus deletus Thomson : Sweden, Lapland. 1♀, at ZIL.

New for Italy: Süd-Tirol, San Martino di Castrozza, 1444m, leg. E. Bauer, 18.VII.1934. 1♂, at ZSM .

Finland (1), Germany (1), Hungary (1), Italy (1), Netherlands (1), Sweden (20), Switzerland (12), United Kingdom (4).

Distribution. Holarctic.