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In certain localities in the Province of Tucumán, Argentine Republic, it was shown that the most prevalent anopheline mosquito during the summer of 1926 was A. pseudopunctipennis; its greatest concentration immediately antedated the peak of the epidemic malaria season; house captures of anopheles showed over 99 per cent of this species; 2.8 per cent of 435 specimens dissected proved positive for malarial parasites.
It is thought that this species was solely responsible for malaria transmission in the region studied.
Received March 3, 1927.
1 The work on which this report is based was conducted with the support and under the auspices of the International Health Board of the Rockefeller Foundation and the National Department of Hygiene of the Argentine Republic.
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