Arge melanochra (Gmelin, 1790)

Arge melanochra

One of two Arge species with a yellow abdomen and a black blotch under the stigma. In Arge melanochra the smudge beneath the stigma does not extend right across the wing (not extending beyond the radial cell). The hind femur is black.

Larvae feed individually on hawthorns. Larvae have 9 pairs of abdominal legs, whereas the similar larva of Arge ustulata has 10 pairs. This species is most often encountered in the south.

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Status: Infrequent

Distribution: England

Flight period: late May to August

Plant associations: Crataegus sp. (hawthorns)

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

Stritt, W. 1960: Die bisher unbekannte Larve der Blattwespe Arge melanochroa Gmel. (Hym., Symph.). - Beiträge zur naturkundlichen Forschung in Südwestdeutschland, Karlsruhe 19(1): 58-59.