1. (1) Andrewartha, H. G.: Diapause in relation to the ecology of insects. Biol. Rev., 27, 50, 1952.
2. (2) Bates, M.: The natural history of mosquitoes. New York, Mac Millan Co., 1949.
3. (3) Christophers, S. R., Sinton, J. A. and Covell, G.: How to do a malaria survey. Delhi, Hlth Bull., no. 14, 1936.
4. (4) Cousin, G.: Étude expérimentale de la diapause des insectes. Bull. Biol. Fr. et Belg., Suppl. 15, 1932.
5. (5) Farid, M. A.: Relationships between certain populations of Culex pipiens Linnaeus and Culex quinquefasciatus Say in the United States. Amer. J. Hyg., 49, 83, 1949.