﻿EXPERIMENTS IN MALARIAL TRANSMISSION BY MEANS OF 

 MYZOMYIA LUDLOWII THEOB. 



By Charles S. Banks. 

 (From the Entomological section, Biological Laboratory, Bureau of Science, 



Manila, P. I.) 



1. Introduction. 



2. Breeding Places of the Mosquitoes. 



3. Life History of Myzomyia ludlowii Theob. 



4. Mosquitoes and Malarial Parasites. 



introduction. 



Physicians in the Philippine Islands have for several years been 

 desirous of determining with greater certainty the exact species of 

 Anpphelince responsible for the transmission of malaria in this region, 

 although as far as I am aware no definite experiments looking to this 

 end have ever been carried on. 



In the year 1906 a very severe epidemic of sestivo-autummal fever, 

 resulting in several deaths both among the American and Filipino 

 workmen, broke out in a camp some 6 kilometers from Manila on the line 

 of the new waterworks excavations. I went to the scene of the trouble 

 to study the features of the infection, but not until some time after it 

 had been decided to abandon this camp and all the workmen, including 

 also the families of the Filipinos, had moved away. A very brief visit 

 of two or three hours, made at a time previous to the breaking up of the 

 camp, enabled me to determine the actual state of existence of these 

 people and to find out that practically none of the Filipinos and very few 

 of the Americans used mosquito nets. A great many specimens of 

 Nyssorhynchus barbirostris Theob., were found among clothing in the 

 huts of the workmen. 



A reconnaissance of the immediate vicinity of the camp at the time of 

 the second visit revealed the abundant breeding places of the species 

 of mosquito just referred to, but no further attempts were made defi- 

 nitely to fix the blame of malarial transmission upon the species found. 



In December, 1906, word came from the United States naval station 

 at Olongapo, Zambales, that malaria was very prevalent among the 

 large body of marines in barracks at that place and that it was of a very 



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