396 JOURNAL, BOMBAY NATURAL HISTORY SOCIETY, Vol. XX. 



traverse almost the same ground as that covered by Captain Liston, 

 I. M. S., in a paper read before this Society (Bombay Natural 

 History Society in November 1908, vide Journal, Vol. XVIII, 

 pp. 872-881. Those of you, who take an interest in the question 

 of Bombay Malaria, would do well to read this paper, if you have 

 not already done so, as it gives an exceedingly clear exposition 

 of the more important points in the lifehistory of the malarial 

 parasite in man and in the mosquito, and deals also in a very 

 practical manner with the problem of malaria prevention. But 

 there is another reason why 1 must direct your attention to 

 Captain Liston's paper, because it contains the first announcement 

 of a discovery regarding malaria of the greatest importance to 

 the citizens of Bombay. This discovery relates to the species of 

 mosquito concerned in the dissemination of malaria in the City. 

 Briefly, Captain List-on, while investigating conditions in the Frere 

 Road at a time when malaria had become epidemic there, found 

 that only two species of anopheles mosquitoes were present in 

 that locality. These two species were * Nyssorhynchus st&phensi 

 and Myzomyia rossi. Now, although it had been shown experi- 

 mentally that both of these mosquitoes could be infected with 

 malaria in the Laboratory, neither of them had been shown to 

 transmit malaria in nature, and the careful examination of many 

 hundreds of specimens of M. rossi in various parts of India had 

 failed to show a single infected insect. And although N. st&phensi 

 had received less attention than M. rossi, it had likewise never 

 been shown to be really concerned in the dissemination of malaria 

 until 1908, when Captain Liston discovered that it was responsible 

 for the spread of the disease in the Frere Road. 



Since Captain Liston's original observation the examination of 

 nearly a thousand mosquitoes caught in the Frere Road has fully 

 confirmed his conclusions, N. stephensi being found infected with 



* I have just been informed by Major S, P. James, I.M.S., that the mosquito 

 formerly described under this name is now to be placed in the genus Neocellia 

 and Mr, Theobald, the well known authority in mosquitoes, has agreed with 

 him that this is the better classification. 



In future, therefore, N. Stephens} will stand for Neocellia stephensi rather than 

 Nyssorhynchus stephensi. 



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