Listrognathus compressicornis (Gravenhorst, 1829)

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 : 60-61

Listrognathus compressicornis (Gravenhorst, 1829)

Listrognathus is an easier genus to recognise by habitus. The females are rather robust with long white banded antennae and a thick downcurved ovipositor. Some species have a tooth on their frons medially.

L. compressicornis is a predominantly black species, no white markings are present apically on its metasoma. Its ovipositor is more or less straight, but the nodus is downcurved in profile (HORSTMANN, 1989). With one exception all our reported specimens were observed in autumn (September-October) on old trees near cities or meadows, presumably searching for its known lepidopteran hosts Furcula bifida (Brahm, 1787) and Furcula furcula (Clerck, 1759) ( Lepidoptera : Notodontidae ), which are both present in Belgium and the Netherlands

(populations peaking in August), varying from locally rather common to uncommon. First report for Belgium and the Netherlands.

MATERIAL EXAMINED:

BELGIUM: • 1 ♀; Dorent (OVL); 50°54’13”N 3°55’44”E; 4/x/2017; J. Vindevoghel leg.; field observation; F. Verheyde det. (ObsID: 144719361) . • 1 ♀; Damme , Weiden Damse Vaart West (WVL); 51°14’54”N 3°15’45”E; 21/ix/2019; J. Mees leg.; field observation; F. Verheyde det. (ObsID: 179962923) .

THE NETHERLANDS: • 1 ♀; Boukoul , Blankwater (LIN); 51°12’42”N 6°03’52”E; 26/vi/2020; A. Wijker leg.; field observation; L. Bendixen det. (ObsID: 201444463) . • 1 ♀; Thorn (LIN); 51°09’41”N 5°51’20”E; 11/x/2020; H. Mertens leg.; field observation; F. Verheyde & L. Bendixen det. (ObsID: 201444463) .