Exyston pratorum (Woldstedt, 1874)

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 : 127

Exyston pratorum (Woldstedt, 1874)

Exyston also belongs to the former tribe Exenterini , which does not have tibial spurs on the hind tibia (and only one spur on the mid tibiae). Their first tergite has a basolateral angulation (and is 1.4–3.6× as long as wide), their tarsal claws are simple and the lower tooth of the mandible is not longer than the upper tooth ( TOWNES, 1969).

Exyston pratorum has the occipital carina and the hypostomal ridge connected, above the mandibular base. The length of the first tergite is approximately 1.6x its width. Its metasoma is red, starting from the second tergite ( KASPARYAN & TOLKANITZ, 1981). The only known host is the already mentioned sawfly Arge ustulata (Linnaeus, 1758) (Symphyta: Argidae ) ( WEIFFENBACH, 1988). First report for the Netherlands; confirmed in Belgium.

MATERIAL EXAMINED:

BELGIUM: • 1 ♀; Somal (NA); 8/v/2008; P.-N. Libert leg.; coll. PNL; field observation; D. Kasparyan det.

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