Eridolius bimaculatus (Holmgren, 1856)

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 : 126

Eridolius bimaculatus (Holmgren, 1856)

Eridolius spp. usually have the lower tooth of the mandible shorter or subequal to the upper tooth and the first tergite does not have any laterobasal corners ( TOWNES, 1969).

The areolet is open in E. bimaculatus . Its face is wide and the temples have a minimum length of 0.5–0.8× from its transverse diameter of the eyes. Its frons is black without yellow spots, but the face does have characteristic square white-yellow spots with a specific pattern. Its flagellum has 21 to 26 segments. It is a parasitoid of the sawfly Nematus bergmanni Dahlbom, 1835 (Symphyta: Tenthredinidae ), which lives on Salix ( KASPARYAN & TOLKANITZ, 1981) .

First report for Belgium; unconfirmed in the Netherlands.

MATERIAL EXAMINED:

BELGIUM: • 1 ♂; Beernem , Beverhoutsveld (WVL); 51°10’27”N 3°17’19”E; 19/viii/2020; A. De Ketelaere leg.; coll. ADK; field observation; A. De Ketelaere & H. Meijer det. (ObsID: 206040970) .