Barycnemis angustipennis (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 : 118

Barycnemis angustipennis (Holmgren, 1860) (Fig. 63 A–B)

As mentioned in our section on localities (heathlands of Bruges) our specimens reported here were nearly all caught in the context of the project near Bruges, often with pitfall traps. Barycnemis spp. can be distinguished from other genera by their apically curving spurs on the hind legs, the more or less linear to slightly upcurved sternaulus (Fig. 64B) and their longer propodeum (often with the basal area longer than the petiolar or apical area; see for example Fig. 64A). Their legs and ovipositor can be robust (see for example Fig. 64A). Several species are very elongate ( KHALAIM & YURTCAN, 2011). We have also tried to identify males, but in the end results were too uncertain to integrate. With an older key (HORSTMANN, 1980b) we were able to split the males in different species groups ( B. gravipes -group with more robust species and the vertex and temples densely punctate and B. 118ellator -group with more elongate species and the vertex and temples very finely punctate). Although hypothetically, it is highly probable males of all three reported species are present in those specimens (coll. KBIN/RBINS; project Brugse heiderelicten). Some species are known to parasitize Staphylinidae ( Coleoptera ), especially Bledius spp. ; see AUBERT, 1970.

Barycnemis angustipennis superficially looks like B. gravipes (Gravenhorst, 1829) (Fig. 63 A). Its first tergite is rather robust, its sternaulus is wide and the first segment of the hind tarsus is smaller than the hind tibiae. However, its head is not prominent (widened) anteriorly (Fig. 63B) and its ovipositor sheaths are shorter than the first tergite. The dorsolateral area of the propodeum is smooth and densely punctate dorso-posteriorly. Our specimen has 33 flagellomeres and measured 7 to 8 mm ( KHALAIM, 2004b).

First report for Belgium; unconfirmed in the Netherlands.

MATERIAL EXAMINED:

BELGIUM: • 1 ♀; Sint-Andries, Beisbroek – Hoog; 16/v/2014; W. Dekoninck et al. (KBIN) leg.; coll. KBIN/RBINS (project Bruges heathlands); pitfall trap (2-16); F. Verheyde det. ; Fig. 63A-B. • 1 ♀; Somal (NA); 19/v/2014; P.-N. Libert leg.; field observation; coll. PNL; A. Khalaim det.