Cymodusa declinator (Gravenhorst, 1829)

Verheyde, Fons, Hoekstra, Paul, Libert, Pierre-Nicolas, Meijer, Hilco, Ketelaere, Augustijn De, Vandaudenard, Thibaud, Belgers, Dick & Brosens, Edwin, 1880, Two hundred and five ichneumonid wasps reported for the first time in Belgium and the Netherlands (Hymenoptera: Ichneumonidae), Belgian Journal of Entomology 122, pp. 1-142 : 36

Cymodusa declinator (Gravenhorst, 1829)

Cymodusa spp. do not have glymmae, the areolet is complete and the lower margins of the eyes (which are at least sparsely hairy) are converging ventrally ( TOWNES, 1970b).

C. declinator belongs to a species complex with C. leucocera Holmgren, 1859 . Characteristically, the females have white bands on their antennae. For C. declinator these are the basal flagellomeres 4–6; for C. leucocera 6–10. There are also other differences in its propodeal carination and its colouration (see HORSTMANN, 2013). The status of both species is not entirely clear for the Low Countries. Although both species have been validly described, Horstmann felt the necessity to revise and restate them, and some authors in the 19 th century seem to have made errors and/or even used Campoplex declinator as a synonym. Because of these issues, we hereby restate the species’ presence in the Netherlands, following the descriptions by Horstmann. First report for the Netherlands; unreported in Belgium.

MATERIAL EXAMINED:

THE NETHERLANDS: • 1 ♀; Drachten-Azeven (FR); 53°06’49”N 6°09’00”E; 27/vii/2020; H. Meijer leg.; coll. HM; field observation; H. Meijer det.