Some little-known species of Risiocnemis Cowley from the Philippine Islands, with notes on their synonymy, morphological characters and larval structure (Zygoptera: Platycnemididae)

The sta'us of 5 of the 14 species of /to/ocnemwknowntooccurinthe Philippines is discussed, and detailed redescriptions are presented of all. Needham’s group characters of the genus are analysed and considered well founded. The specific characterizations are based on a study of <5 and 9 type specimens of the misinterpreted R. ignea (Brauer) as well as the unique 9 types of R. incisa Kimmins and reflexa Kimmins, two species erroneously recorded from Borneo. Additional notes and figures are given of the type-species R. serrata ( Hagen in Selys) with its larva, and of R. haematopus (Selys), all from the island of Luzon. Illustrated redescriptions are supplied of R. ignea and incisa, whose characters are compared with those of reflexa, which turns out to be synonymous with the earlier described haematopus. In spite of their uniform colour-pattern, females belonging to the species-group here treated appear to be well recognizable on details of structure found on pro- and mesothorax.