Stromboceros delicatulus is a Palearctic species of sawflyBenson, R.B., 1952. Handbooks for the Identification of British Insects. Hymenoptera, Symphyta, Vol 6, Section 2(a-c), Royal Entomological Society, London belonging to the genus Stromboceros.
Its larvae feed on ferns, e.g., Athyrium filix-femina (common ladyfern), Dryopteris filix-mas (male fern), Onoclea sensibilis (sensitive fern) and Pteridium aquilinum (bracken fern).
References
External links The sawflies (Symphyta) of Britain and Ireland