Males and females have an abdomen entirely black and the legs are yellow with dark bases to the femora. The antennae of the male are enlarged and compressed laterally. Adults are elusive.
Metallus pumilus larvae mine the leaves of raspberry and blackberry plants eventually forming a large blotch mine. In addition to the ventral thoracic spots, also found on albipes, Metallus pumilus larvae have a black spot centrally on the underside of the first abdominal segment.
Size: 3.5 - 4.5mm
Distribution: England, Scotland
Flight period: Poss. bivoltine. May to June and July to August
Plant associations: Rubus idaeus and Rubus fruticosus (raspberry and blackberry)
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