Cytisogaster picta (Klug, 1817)

Cytisogaster picta

One of three small species formerly included in the Rhogogaster picta group. All three have bicolorous blue-green/black stigma. This species is likely parthenogenic without any males or males undistinguishable from other species. The hind tibia are marked with black at the base and apex. Facial markings and saw teeth are diagnostic (see Benson).
Larvae feed on broom.

Size: 6 - 8.5mm

Status: Less common than the other species in this genus

Distribution: England, Wales

Flight period: May to July

Plant associations: Cytisus scoparius (broom)

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