Gelis longicauda (Thomson, 1884)

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 : 94

Gelis longicauda (Thomson, 1884)

This is another species with macropterous females. Its mesopleuron and pronotal collar are somewhat red to orange and its ovipositor sheaths are longer than the hind tibiae ( SCHWARZ, 2016). This species is sometimes confused with Gelis areator (Panzer, 1804) but in contrast to this species (which also has a shorter ovipositor), its mesoscutum is greyish to black (exceptionally with some red markings), while it is often profoundly reddish for G. areator , and the apical tergites of G. longicauda often have a white band. Related to phenology and ecology, both species are often observed on tree stems during the entire year (March–October) and have a wide host range (see YU et al., 2012), with slightly more observations in early spring (March). First report from Belgium; confirmed in the Netherlands.

MATERIAL EXAMINED:

BELGIUM: • 5 ♀♀; Mol , Meergoor (AN); 51°12’42”N 5°09’52”E; 8/iii/2015; Paul en Marianne leg.; field observation; F. Verheyde det. (ObsID: 98598255) . • 1 ♀; Zillebeke , De Palingbeek (WVL); 50°48’51”N 2°54’55”E; 6/iv/2015; M. Valdueza leg.; field observation; F. Verheyde det. (ObsID: 100978476) . • 1 ♀; Westerlo , Asberg (AN); 51°04’44”N 4°54’10”E; 11/vii/2015; Paul en Marianne leg.; field observation; F. Verheyde det. (ObsID: 104248006) . • 1 ♀; Erpe-Mere , Bambrugge (OVL); 50°54’40”N 3°55’51”E; 22/viii/2016; J. Vindevoghel leg.; field observation; F. Verheyde det. (ObsID: 133648906) . • 1 ♀; Mazenzele (VB); 50°56’58”N 4°09’40”E; 21/v/2017; L. Verhelst leg.; field observation; F. Verheyde det. (ObsID: 138923878) […] .

THE NETHERLANDS: • 1 ♀; Zwolle (OR); 52°30’49”N 6°01’24”E; 17/vii/2018; G. Beersma leg.; field observation; F. Verheyde det. (ObsID: 160387647). • 1 ♀; Bloemendaal, Leyduin (NH); 52°20’21”N 4°35’05”E; 29/iv/2019; D. Drukker leg.; field observation; F. Verheyde det. (ObsID: 171378961). • 1 ♀; Borgerveld (GR); 52°55’56”N 7°07’14”E; 1/vi/2019; S. Lamberts leg.; field observation; F. Verheyde det. (ObsID: 173791234). • 1 ♀; Vlieland, Duinkersoord (FR); 53°18’07”N 5°03’09”E; 18/vi/2019; B. Pater leg.; field observation; F. Verheyde det. (ObsID: 179298297). • 1 ♀; Tilburg, Leijbos (NB); 51°32’35”N 5°00’53”E; 2/iv/2020; IWG KNNV Tilburg leg.; coll . PH; field observation; P. Hoekstra det. (ObsID: 191287530) […] .