Alexeter gracilentus (Holmgren, 1857)

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 : 64-65

Alexeter gracilentus (Holmgren, 1857) (Fig. 30 A–B)

Alexeter spp. are slender wasps (first tergite 1.7–4× as long as wide) belonging to the tribe Mesoleiini . Their nervellus is intercepted at or just below the middle and the notauli are distinct in some species. The mandibular teeth are equal or almost so ( TOWNES, 1970b). The genus needs to be revised, but some species already have a firmer taxonomic base.

A. gracilentus is a testaceous species with yellow markings on the mesosoma (Fig. 30 A). The head is relatively small and brownish black, but the face is completely yellow (Fig. 30 B). The first tergite varies from completely testaceous to partly black (see SCHMIEDEKNECHT, 1912).

First report for Belgium; unconfirmed in the Netherlands.

MATERIAL EXAMINED:

BELGIUM: • 1 ♂; Beernem , Beverhoutsveld (WVL); 51°09’28”N 3°18’26”E; 21/viii/2020; A. De Ketelaere leg.; coll. ADK; field observation; H. Meijer & G. Broad det. (ObsID: 201831203); Fig. 30 A–B .