Caliroa tremulae
First found in Norfolk in 1993. The third antennal segment clearly shorter than the fourth and fifth combined. Hind tibia with white basally (one-third). In the male, the hind tarsus entirely black on basal segment. External face of middle tibia white.
Larvae are mucus covered " slugworms" that feed on the underside of aspen leaves. They pupate in the ground.
Size: 4 - 6mm
Status: Rare
Distribution: England
Flight period: June to August
Plant associations: Populus tremula (aspen)
The National Biodiversity Network records are shown on the map below. (See terms and conditions)
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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