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The Winter Breeding and Activity of Culicine Mosquitoes at New Orleans (30°N. Lat.)

A periodic survey of breeding conditions of the Culicine mosquitoes in New Orleans has been made from September 25, 1930 to June 15, 1931. A correlation of this data with meteorological statistics seems to indicate that after a monthly mean temperature of 52.5°F. has been reached little outdoor breeding of Aedes aegypti is encountered. Indoor breeding of this species continues during even the coldest months and is of considerable significance in the overwintering of the species. Culex quinquefasciatus and C. salinarius are apparently hardier species and continue development out-of-doors throughout the entire year, although oviposition may be suspended during part of January and February. Owing to the rather abnormal weather conditions during the period under investigation, it is felt that the season of extensive breeding was curtailed earlier in the winter and its resumption prevented in the spring, thereby making it shorter than might be expected in a normal year.

¹ National Research Fellow in the Biological Sciences.