Several aliphatic amines were formulated as concentrates in various solvents with surfactants and evaluated against mosquito larvae and pupae. These concentrate formulations were diluted with water and the emulsion was added to cups in the laboratory or sprayed on the surface of mosquito breeding sources. The most promising formulations were: 25% Armeen L-15 [beta-RNH2 primary beta amine (R=15 C) and 25% Duomeen L-15 [beta-RNH (CH2) 3 NH2 beta-diamine (R=15 C) ] in automotive diesel oil containing 2% of surfactants. Most formulations produced complete mortality of larvae of Culex pipiens quinquefasciatus Say at 2ppm in the laboratory, and yielded excellent control of larvae and pupae of C. tarsalis Coquillett in experimental ponds at the rate of 0.5 lb/A. Some other formulations were also effective in controlling field populations of Culex species.