Arge cyanocrocea - Broad-barred Fusehorn

One of the black and yellow species, widely distributed north to Fife (Musgrove, 2022). Arge cyanocrocea has a dark band across the forewings beneath the stigma and extending right across the wing. Basal to the band the wing is yellowish and apical to the band the wing is grey. The hind legs are normally yellow with black apices to the femur, tibia and tarsus. However, the amount of black is variable and the hind femurs can be entirely black. The similar Arge melanochra has entirely black hind femurs but the dark wing smudge does not extending all the way across the wing. Identification can be confirmed by the venation in the hind wing.
Adults visit umbels of hogweed, etc.

Larvae feed on Rubus. Ova are deposited into the leaf margins. Larvae initially feed together but disperse as they grow. They overwinter in fibrous cocoons in leaf litter or in the top layers of soil. 

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Size: 7 - 8mm.

IUCN Status: Least Concern
GB Rarity Status: None

Distribution: England, Scotland, Wales, Ireland

Flight period: Univoltine, May to July

Plant associations: Rubus spp. Brambles (Benson, 1952).

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

Musgrove, A.J. 2022. A review of the status of sawflies of Great Britain - Phase 1: families other than Tenthredinidae. Natural England, unpublished