The identification of the larvae of African Simulium.

Identification of the larval stages of African Simulium-vectors of onchocerciasis-is becoming increasingly important. In this paper attention is drawn to the principal morphological structures that are of value for identification and illustrations are given to indicate the various characters mentioned. The author provides an identification key to the larvae of the different species-groups of African Simulium and to the larvae of those species of most importance to man, and also presents a tentative key by which a larva may be placed in the probable instar of its development.