Descriptions of larvae of eight Nearctic species of Dolerus (Hymenoptera: Tenthredinidae) with focus on six Equisetum-feeding species from the Ottawa Region.
The larvae of 8 Nearctic species belonging to the genus Dolerus are described from Ottawa, Canada, for the first time. Six species, D. aprilis, D. tibialis conjugatus, D. gilvipes albifrons, D. apricus, D. acidus and D. subfasciatus, were reared from adults collected on field horsetail, Equisetum arvense, and the larvae of 2 species, D. sericeus and D. nitens, were collected on grasses. The life history of Dolerus spp. is described and an illustrated key to the species is provided. Taxonomic affinities among the species are briefly discussed.