Dispersion and Feeding Habits of Anopheles freeborni

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Abstract
The studies were conducted near Dixon and Yuba City, Cal., in 1944-5. Isolated sources of breeding of A. freeborni were found in rice fields. The habits of this species were studied by frequently examining adults for blood, egg or fat body content at regular successive distances away from the breeding areas. Charts of the population movement revealed that the adults congregated in the breeding areas in the last 3 weeks of Aug. and dispersed in great numbers in Sept. away from breeding grounds. This dispersal extended at least 26 miles southward in one study area. During the congregation and dispersal, blood fed 9 9 were abundant within 10 miles of the breeding [image] area but scarce beyond that distance. The dispersed 9 9 first contained eggs but after Oct. 1 they developed fat bodies which replaced the eggs completely by the 3d week of Nov. In Jan. and Feb. of 1944 the 9 9 contained either eggs, fat bodies or blood. Mass population movements were not found in the spring or summer up to mid-July.
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