Hadrodactylus nigrifemur Thomson, 1883

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

Hadrodactylus nigrifemur Thomson, 1883

Hadrodactylus spp. are rather large (but slender) ctenopelmatine wasps. Their areolet is present and their clypeus is moderately short (its apical margin moderately to rather strongly arcuate). Typical for this genus, the fifth tarsal segments are weakly to strongly elongate and arched ( TOWNES, 1970b).

Most species are not easy to identify. H. nigrifemur has a very short malar space and the lower tooth of the mandible is much longer than the upper tooth. Its propodeum is matt, the tarsal claws are stronger upcurved at apex and the second tarsal segment is longer than the fifth, which is subequal to the third. Its scape and pedicel are blackish dorsally. The prepectal carina is not raised (about as high as the lateral parts). The middle coxae and the hind femora are black ( KASPARYAN, 2011). The Belgian specimen measures 9 mm and counts 45 flagellomeres.

First report for Belgium; confirmed in the Netherlands.

MATERIAL EXAMINED:

BELGIUM: • 1 ♂; Watermaal-Bosvoorde (BR); 15/v/1932; A. Crèvecoeur leg. ; coll. KBIN/RBINS (coll. Crèvecoeur); F. Verheyde det.

THE NETHERLANDS: • 1 ♀; Biddinghuizen (FL); 52°27’48”N 5°48’44”E; 20/v/2020; P. Hoekstra leg.; coll . PH; field observation; P. Hoekstra det. (ObsID: 193453903) .