Allantus cinctus is very active in bright sunlight and is a strong flier. The female abdomen is black with a yellow-white band, which is confined to the fifth tergite. In the male, the abdomen is entirely black. The head is black and the clypeus is deeply incised. The stigma of the forewing is bicolorous cream and black as is the tegula. Hind femora are mostly black (sometimes white at the extreme base) and the tibia are red. [NB. According to Koch, in the holotype and two other males, the basal 2/3rds of the tibia are white as in the female. Koch observes that this seems to be a characteristic that occurs more frequently in western European specimens.] The apical two or three hind tarsal segments are darkened.
Eggs are laid into pockets cut on the underside of leaves and once matured may be visible from above as raised bulges. The larvae feed on members of the rose family. Early instar larvae are greyish-green with a black head. In the final instar the head is yellowish brown with darker areas on the vertex and behind the eyes. The torso is greyish green dorsally and pale yellowish green ventrally. The larval stage last 3 to 4 weeks. They pupate in the pith of cut stems. The summer generation emerges after two or three weeks.
Size: 7 - 10mm
Distribution: England, Scotland, Wales, Ireland
Flight period: At least bivoltine, May to June and July to August
Plant associations: Rosaceae, especially Fragaria spp. and Rosa spp. (rose family, especially strawberry and roses)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
Koch, F., 1988. Zur Differentialdiagnose einiger Allantus-Arten (Insecta, Hymenoptera, Symphyta: Tenthredinidae). Reichenbachia, Staatliches Museum für Tierkunde Dresden, 26(9), pp.43-53.
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
Martelli, M. 1941: Comportamenti biologici e danni dell´Emphytus cinctus L. (Hymenoptera Tenthredinidae) sulla Fragola nell´Emilia. - Bolletino dell' Istituto di Entomologia della R. Università degli Studi di Bologna, Bologna 12: 171-178
Miles, H.W., 1936. On the Biology of Emphytus Cinctus, L., and Blennocampa Waldheimi, Gimm.*(Hym, Symphyta). Bulletin of Entomological Research, 27(3), pp.467-473.
Muche, W., 1972. Die schwarzen Männchen der mitteleuropäischen Allantus PANZER (Tenthredinidae, Blennocampinae). Ent. Nachr.(9), pp.117-118.