Aëdes (Finlaya) kochi which gives its name to this group of species was described by Dönitz in 1901. Since that date a number of species have been described, some of which for a time have been regarded as synonyms, and have subsequently been again elevated to specific rank. This has been due to the close similarity between the females of different species ; when the males have been discovered, marked differences in genitalia characters have enabled the species to be separated. Some members of the group are vicious biters and have considerable nuisance value; A. kochi is also an efficient carrier of Wuchereria bancrofti and as several species have hitherto been confused under this name, it may prove of some importance to be able to separate them.
Larvae of several species have been figured or described, but hitherto insufficient information has been available to form any clear picture of larval relationships. Various members of the Forces recently stationed in the Southwest Pacific area have, by their cooperation, provided a large amount of material for study, in addition to collections made locally. As a result, it has been possible to clear up some of the confusion still existing among certain species, and to gain a broad view of larval relationships which may have some bearing on the evolution of the group.
This paper includes descriptions of males of two described species (A. kochi, A. wallacei) and of both sexes of four new species (A. bougainvillensis, A. fijiensis, A. alocasicola, A. gahnicola) ; descriptions of larvae of all the foregoing and of A. solomonis; descriptions of pupae of A. kochi, A. bougainvillensis, A. alocasicola, A.gahnicola and A. solomonis; and notes on the distinctive characters of five additional species (A. poicilius, A. samoanus, A. flavipennis, A. aranetantus, A. avistylus).