Descriptions of three larvae of Osmylus species from Japan (Neuroptera: Osmylidae), with a proposed naming system for the larval sclerites

The naming system of sclerites on osmylid larvae is proposed by observation of three Japanese osmylid species, Osmylus ( Osmylus ) hyalinatus McLachlan, 1875, O . ( O .) pryeri McLachlan, 1875, and O . ( Plesiosmylus ) tessellatus McLachlan, 1875. The last instar larvae of the genus and species are described with biological notes and a key to the species. Osmylus kisoensis Iwata, 1928 is synonymized with O. ( O. ) pryeri McLachlan, 1875.