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A survey of Anopheles gambiae in Brazil was carried out in May, June, July, and the first week in August, 1939, months representative of the climate of the country at the close of the wet, and well into the dry, seasons. We were enabled to obtain in a comparatively short time a great deal of first-hand information about A. gambiae in Brazil and its effect upon the population as we were supplied with full facilities for transportation and field laboratories.
I. DETAILED STUDY OF A FRONTIER Opportunity for a full study of the advance of a species of anopheles into new territory is not often offered to the investigator, and is a matter of much sanitary importance. We have therefore described in some detail the frontier shown on the map, representing a portion of the Jaguaribe River above and below Iguatú in Ceará.
Received October 18, 1939.
1 This work was undertaken at the invitation of Dr. F. L. Soper, director of the International Health Division of The Rockefeller Foundation in South America, and of Dr. D. B. Wilson, in charge of the Serviço de Malaria do Nordeste at Fortaleza, Brazil. They kindly assigned to me as assistants at different times during the summer, Drs. Paulo C. A. Antunes, Gustavo de Oliveira Castro, Gladstone Deane, Leonidas Deane, and Maria Paumgartten.
2 The present distribution of A. gambiae in Brazil and a study of its breeding places have been thoroughly investigated by R. C. Shannon and members of the Serviço de Malaria do Nordeste do Brasil. Their findings will be published at an early date.
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