Polyblastus macrocentrus Thomson, 1888

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 : 127-128

Polyblastus macrocentrus Thomson, 1888

Species in the genus Polyblastus have the fore wing vein 2m-cu normal. Their ovipositor is more or less straight. The females carry their eggs externally at the ventral side of the metasoma ( TOWNES, 1969).

Polyblastus macrocentrus has a closed areolet and is the only species with simple tarsal claws and the costulae (on the propodeum ) very weak. The upper valve of the ovipositor is not compressed towards the apex ( KASPARYAN & TOLKANITZ, 1981). Hosts are sawflies of the genus Hoplocampa (Symphyta: Tenthredinidae ). Another rearing record from The Netherlands and more information on the ecology can be found in ZWAKHALS & BLOMMERS, forthcoming.

First report for the Netherlands; unreported in Belgium.

MATERIAL EXAMINED:

THE NETHERLANDS: • 1 ♀; Ureterp , Terrein de Fûgelhelling (FR); 53°06’16”N 6°08’24”E; 7/v/2015; H. Meijer leg.; coll. HM; field observation; H. Meijer det.