Tersilochus cognatus (Holmgren, 1860)

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 : 121

Tersilochus cognatus (Holmgren, 1860)

= syn. T. jocator Holmgren, 1859 , synonymized by HORSTMANN (2001: 25)

Tersilochus cognatus forms a species-complex in Horstmanns key ( ‘ jocator -Gruppe’). The sternaulus is wide, covering at least half of the mesopleuron; the thyridia are feeble and the ovipositor tip has two teeth dorsally. For T. cognatus itself, its ovipositor sheaths are long, at least 1.2× as long as the first tergite (but often much longer). Its clypeus is rounded in profile and its metasoma is reddish (HORSTMANN, 1971).

First report for Belgium; confirmed in the Netherlands.

MATERIAL EXAMINED:

BELGIUM: • 1 ♀; Somal (NA); 30/iv/2012; P.-N. Libert leg.; coll. PNL; field observation; A. Khalaim det. • 1 ♀; Beernem , Gevaerts (WVL); 51°08’29”N 3°18’52”E; 10/iv/2020; A. De Ketelaere leg.; coll. ADK; A. De Ketelaere & F. Verheyde det. (ObsID: 202473064) . • 1 ♀; Poperinge , Wippehoek (WVL); 50°53’36”N 2°45’48”E; 8/v/2020; F. Verheyde leg.; coll. FV; field observation on gall of Biorhiza pallida (Olivier, 1791) ; F. Verheyde det. (ObsID: 190787642).

THE NETHERLANDS: • 6 ♀♀ 1 ♂; Tilburg , Leijbos (NB); 51°32’38”N 5°00’52”E; 16/iv/2020; IWG KNNV Tilburg leg.; coll . PH; malaise trap; P. Hoekstra & F. Verheyde det. (ObsID: 195629210). • 2 ♀♀ 7 ♂♂; Almere , Hanny Schaftpark (FL); 52°22’50”N 5°13’57”E; 18/iv/2020; P. Hoekstra leg.; coll . PH; pan trap; P. Hoekstra & F. Verheyde det. (ObsID: 189565211) .