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Natural Malaria Infection in Anopheles Mosquitoes¹

In 1917 a series of examinations was made of Anopheles mosquitoes collected under natural conditions to determine the rate of infection in malarial regions. The collections for the study were made at Mound, La., and at Parchman, Miss., under the direction of Capt. D. L. Van Dine of the Bureau of Entomology, and the specimens were shipped to New Orleans for dissection.

At Mound the mosquitoes were taken from negro tenant houses on a plantation typical of the Mississippi river delta country and specimens from this source were received from December, 1916, to June, 1917, with an additional number the following October.

The Parchman collections were made in buildings occupied by the negro convicts on the state penitentiary farm during the months from May to November, 1917. This farm is located in Sunflower county, Mississippi, and consists of about 15,500 acres of delta land, most of which is cleared and in cultivation.

¹ In coöperation with Dr. C.-C. Bass of Tulane University and with the International Health Board of the Rockefeller Foundation.