Dusona thomsoni Hinz, 1963

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 : 40

Dusona thomsoni Hinz, 1963

A smaller species of Dusona , measuring approximately 7 to 8 mm and counting 39-42 flagellomeres. The epipleurum of the third tergite is fused with the tergite, its genal carina joins the oral carina close the base of the mandible (genal index 0.1–0.2) and the ventral part of the prepectal carina is not distinctly raised. The second tergite is marked black dorsally and the following tergites are marked with black dorsally and with red laterally (to a variable extent). The males have reddish brown claspers ( HORSTMANN, 2009). Both D. thomsoni and the abovementioned D. genalis are not often reported, and missing in some countries in Western continental Europe, but this could be due to the difficulties of identifying them in the first place. Ematurga atomaria (Linnaeus, 1758) ( Lepidoptera : Geometridae ), also mentioned above, is an abundant possible host in the Low Countries ( HORSTMANN, 2011; SHAW et al., 2016).

First report for the Netherlands; unreported in Belgium.

MATERIAL EXAMINED:

THE NETHERLANDS: • 1 ♂; Drachten (FR); 53°05’59”N 6°06’24”E; 27/iv/2012; H. Meijer leg.; coll. HM; field observation; H. Meijer det. • 1 ♀; Drachten (FR); 53°05’59”N 6°06’24”E; 2/v/2012; H. Meijer leg.; coll. HM; field observation; H. Meijer det. • 1 ♂; Drachten (FR); 53°05’59”N 6°06’24”E; 1/vii/2012; H. Meijer leg.; coll. HM; field observation; H. Meijer det. • 2 ♂♂; Drachten (FR); 53°05’59”N 6°06’24”E; 3/vii/2012; H. Meijer leg.; coll. HM; field observation; H. Meijer det.