Allantus coryli is similar to cingulatus but can be separated with the following features described by Stritt. The clypeus in coryli is rough textured but smooth in cingulatus. The third antennal sector is longer than the fourth. The thorax is black though the tegulae are white or at least edged in white. The scutellum is punctured all over rather than just at the margin as is the case in cingulatus. The abdomen is black but with a white or yellow in the female. The front femora are black at least on the hind face. The hind femora may only be dark at the apex and in the male maybe red. The tibiae and tarsi are reddish but on the hind tibiae the bases are white. The hind tarsus is darker than the apex of the tibia. Usually, the clypeus, mandibles and all sternites are dark.
Larvae are free living and feed on hazel.
Size: 8 - 10mm
Flight period: May to June
Plant associations: Corylus avellana. (hazel)
Benson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London
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Magis, N. 1999: Les Allantini de la Belgique et des régions limitrophes (Hymenoptera Tenthredinidae Allantinae). - Belgian Journal of Entomology, Brussels 1(2): 275-310; 9 figs
Stritt, W. 1937: Eine neue Art der Blattwespen-Gattung Emphytus Kl. (Hym., Tenthr.). - Konowia, Wien 16: 296-300
Stritt, W. 1939: Die Hasel und ihre Gäste aus der Familie der Blattwespen (Hym. Tenthr.). - Entomologische Zeitschrift, Frankfurt a. M 53(20-21): 158-162