Theroscopus ochrogaster (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 : 102

Theroscopus ochrogaster (Thomson, 1888)

As mentioned above, Theroscopus spp. are closely related to Orthizema spp. Therefore, both genera were treated together in the key from SCHWARZ & SHAW (2011). The females of Theroscopus spp. have their frons and mesoscutum at most partly granulate. Their ovipositor is robust sometimes and area superomedia is at most 1.4× as long as wide. The lower margin of their clypeus has paired teeth in most cases and the antennae does not often have a white ring.

Theroscopus ochrogaster is a species which needs to be keyed carefully and has no real distinctive features. It is rather characteristically coloured with black tergites both basally and apically, and orange antennal segments basally. Important is the length of the third antennal segment (2.8–3.1× as long as wide) and the area superomedia (0.8–1.4× as long as wide). The second and third tergite are completely orange ( SCHWARZ & SHAW, 2011).

First report for the Netherlands; unreported in Belgium.

MATERIAL EXAMINED:

THE NETHERLANDS: • 1 ♀; Haarzuilen (UT); 52°07’25”N 5°00’02”E; 9/vii/2020; S. De Waart leg.; coll. FV; malaise trap; F. Verheyde det. (ObsID: 208392105) .