STUDIES ON SOME PARASITIC CRUSTACEANS ON AFRICAN FRESHWATER FISHES, WITH DESCRIPTIONS OF A NEW COPEPOD OF THE GENUS ERGASILUS AND A NEW BRANCHIURAN OF THE GENUS CHONOPELTIS

SUMMARY Two new parasitic crustaceans of African freshwater fishes are described. These are the copepod Ergasilus Zutue, from L. Rudolf, and the branchiuran. Chonopeltis flaccijrons from various parts of the Congo system. A description of the true male of Argulus ambloplites is given, and in the light of its structure it is suggested that A. jollymani is best regarded as a sub‐species of A. ambloplites. The male of Argulus dartvellei is described for the first time. Notes of the specimens of Chonopeltis recorded from the Ue 16 and Okavango Rivers are given and it is shown that neither can be satisfactorily identified at present. Keys to the species of Chonopeltis are given. Some recently established diat ribution records of parasitic crustaceans of African freshwater fishes are listed.