THE PHILIPPINE 
JOURNAL OF SCIENCE 
B. TROPICAL MEDICINE 
VOL. X MAY, 1915 No. 3 
MALARIA IN THE PHILIPPINE ISLANDS 
Il. THE DISTRIBUTION OF THE COMMONER ANOPHELINES AND THE 
DISTRIBUTION OF MALARIA * 
By M. A. BARBER, ALFONSO RAQUEL, ARISTON GUZMAN, and 
ANTONIO P. Rosa 
(From the Biological Laboratory, Bureau of Science, Manila, P. I.) 
TWO PLATES AND 1 TEXT FIGURE 
This work logically follows that of Walker and Barber 2 on the 
transmission of malaria in the Philippine Islands. In this work 
the infectivity to malarial parasites of Anopheles (Pseudomy- 
zomyia) rosstui, Anopheles (Myzomyia) febrifer, Anopheles (My- 
zorhynchus) barbirostris, Anopheles (Myzorhynchus) sinensis, 
and Anopheles (Nyssorhynchus) maculatus was compared by 
feeding experiments on gamete carriers. Some 184 feeding ex- 
periments and the dissection of some 1,287 mosquitoes were 
carried out with special reference to the relative infectivity of 
different species. It was found that of 162 specimens of Ano- 
pheles febrifer dissected 108, or 66.66 per cent, were infected; 
of 3 A. maculatus, 2, or 66.66 per cent, were infected; of 187 
A. rossit, 35, or 18.71 per cent, were infected; of 100 A. bar- 
birostris, 6, or 6 per cent were infected; and of 12 A. sinensis 
none were infected. These numbers and percentages are based 
- on certain strictly comparative experiments in which the different 
species were fed at the same time on the same patient, in which 
only females that were known to have sucked blood were con- 
sidered, and in which it was known that the patient’s blood con- 
*Read before the Philippine Islands Medical Association, November 6, 
1914, 
* This Journal, Sec. B (1914), 9, 381-439. 
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