Diplazon pectoratorius ( Thunberg 1824, Ichneumon

Klopfstein, Seraina, 2014, Revision of the Western Palaearctic Diplazontinae (Hymenoptera, Ichneumonidae), Zootaxa 3801 (1), pp. 1-143 : 44-45

Diplazon pectoratorius ( Thunberg 1824, Ichneumon )

Ichneumon angustorius Thunberg 1824

Bassus pectoratorius Gravenhorst 1829 (homonym)

Bassus pulchripes Provancher 1875

Polysphincta pleuralis Provancher 1875

Homotropus pectoratorius nigrithorax Strobl 1902 Homocidus akaashii Uchida 1931

Diagnosis. Fore wing length 4.5–7 mm. Antenna in females with 17–20, in males with 18–21 flagellomeres. Face with punctures disappearing against the coriaceous background. Mesopleuron smooth and polished, with very weak but dense punctures also on upper half. Propodeum with carinae reduced, only pleural and parts of lateral longitudinal carinae present, petiolar area at most weakly indicated by rugae. Tergite 1 1.0–1.2 times as long as wide in females, 1.2–1.6 in males, tergite 2 0.65–0.8 in females, 0.7–0.9 in males; tergites 2 and 3 strongly coriaceous and matt, punctures indistinct, sculpture extending across transverse impressions. Transverse impressions distinct on tergites 1–3, rarely indicated on tergite 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 on clypeus and mouthparts, hind corner of pronotum, tegula, subtegular ridge, large shoulder mark, upper mesepimeron; scutellum at least with yellow tip, remainder orange. Mesosoma largely orange, at least on mesopleuron and mesosternum, often also on mesoscutum and part of propodeum; the distinctive orange colouration is very rarely reduced to a dark red on mesopleuron. Legs including coxae orange, fore and mid coxae often with yellow apices; femora orange; hind tibia white with an irregular subbasal dark spot and a dark apex, hind tarsus dark, but first tarsomere with white base. Metasoma black.

Colouration of males. As in females but with yellow ventrally on antenna, entire face, propleuron, most of mesosternum and part of mesopleuron. Fore and mid coxae and part of legs yellow.

Material examined. Lectotype ♂ of Ichneumon pectoratorius Thunberg : Sweden, no locality data. 1♂, at UU . Lectotype of Ichneumon angustorius Thunberg : Sweden, no locality data. 1♀, at UU .

Austria (2), Finland (4), France (1), Germany (1), Hungary (80), Norway (1), Sweden (80), Switzerland (>100), Turkey (1), United Kingdom (20).

Distribution. Holarctic, Neotropical, Oriental.

Figures. Propodeum ( Fig. 13 B, 17A), habitus ( Fig. 29 D).

Figures

FIGURE 29. Habitus of Diplazon species. A. Diplazon laetatorius. B. Diplazon nordicus sp. nov. C. Diplazon parvus sp. nov. D. Diplazon pectoratorius. E. Diplazon scutatorius. E. Diplazon varicoxa.

FIGURE 13. A. Diplazon multicolor ♀, metasoma. B. Diplazon pectoratorius ♀, propodeum. C. Tymmophorus obscuripes ♀, propodeum. D. Xestopelta gracillima ♀, mesoscutum showing colour pattern. E. Campocraspedon caudatus ♀, metasoma. F. Campocraspedon caudatus ♂, metasoma. G. Daschia brevitarsis ♀, metasoma. H. Homotropus nigritarsus ♂, antenna. I. Enizemum ornatum ♂, antenna.