Diplazon tibiatorius ( Thunberg 1824, Ichneumon

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 47

Diplazon tibiatorius ( Thunberg 1824, Ichneumon )

Bassus albosignatus Gravenhorst 1829

Diagnosis. Fore wing length 5.0–7.0 mm. Antenna of both sexes with 16 to 18 flagellomeres. Face with punctures strong, clearly distinct from the background sculpture. Mesopleuron smooth and polished and strongly punctate also covering most of upper half. Propodeum with a full set of carinae enclosing basal, lateral and petiolar areas. Tergite 1 0.8–1.0 times as long as wide in females, 1.0– 1.2 in males, tergite 2 0.55–0.7 times as long as wide in both sexes; tergites 2, 3 and 4 with large, distinct punctures on a rugose or on tergites 3 and 4 rather smooth and polished background, punctures with distinct margins. Transverse impressions distinct on tergites 1–4. Metasoma dorsoventrally depressed.

Colouration of females. Antenna dark brown. Head and mesosoma black, face with yellow along inner orbits, without yellow central face patch, yellow medially on clypeus and mouthparts, hind corner of pronotum, tegula, subtegular ridge, usually small shoulder mark, upper mesepimeron; scutellum white. Legs orange, coxae black with yellow apices, hind coxa orange (but see Notes); femora orange; hind tibia black-white-black banded, hind tarsus dark. Metasoma black, tergite 1 usually with a white apex.

Colouration of males. As in females but with yellow ventrally on scape and pedicel, central yellow face patch. Fore and mid coxae with yellow apices.

Material examined. The lectotype of this species has been designated by Cresson (Cresson 1916) and is stored at the Academy of Natural Sciences in Philadelphia ( Yu et al. 2012). This renders the material in Uppsala paralectotypes, despite the labeling of the male as lectotype by Diller (1980): Paralectotypes of Ichneumon tibiatorius Thunberg : Sweden. 1♂, 1♀, at UU .

France (3), Hungary (50), Russia (2), Sweden (20), Switzerland (>100), Turkey (1).

Distribution. Holarctic and Neotropical.

Notes. There is a form of Diplazon tibiatorius with black hind coxae that appears as “ Diplazon cf. tibiatorius ” in the key. In the past, such specimens have usually been identified as D. varicoxa , from which they clearly differ by the characters given in the key. Only the colour of the coxae distinguishes these specimens from the typical D. tibiatorius with orange coxae; they thus probably do not represent a separate species.