Cladius grandis (Serville, 1823)

Cladius grandis

According to Prous et al, 2019, there is currently no reliable key or species treatment available for this genus. The description follows Benson.
The body is mainly yellow with the head, upper surface of antennae, middle of the pronotum, the mesonotum and the metanotum black. The wings are yellowish basally. The stigma is brown with darker margins, the costa yellow and the rest of the venation brown to piceous.

Larvae feed gregariously on poplars and willows.

 

Size: 7 - 9mm

Status: Widespread

Distribution: England, Scotland, Ireland

Flight period: Bivoltine, May to August

Plant associations: Populus spp. and Salix spp. (poplars and willows)

References:

Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London

Liston A, Knight G, Sheppard D, Broad G, Livermore L (2014) Checklist of British and Irish Hymenoptera - Sawflies, ‘Symphyta’. Biodiversity Data Journal 2: e1168. https://doi.org/10.3897/BDJ.2.e1168

Prous, M., Liston, A., Kramp, K., Savina, H., Vårdal, H. and Taeger, A., 2019. The West Palaearctic genera of Nematinae (Hymenoptera, Tenthredinidae). ZooKeys, 875, p.63.