50 



L. Rogers — Special Bepori on Fever in Dinajpur List. [Supplt. 



already mentioned. While making collections in the houses in differ- 

 ent parts of the town striking differences in the local distribution were 

 met with. Thus, while A. Rossii abounded in the central tank strewn 

 portion, and A. Fuliginosus and A. Listoni near the streams on either 

 side of the town, there was a dry zone between the central and the 

 western portions in which a very careful search failed to reveal a single 

 anophele. Moreover, the more intelligent inhabitants of the riverine por- 

 tion where most A. Listoni were found were convinced that this was the 

 most malarious portion of the town in the rainy season, although this 

 was not evident at the time of my visit in the dry healthy season. 



Turning next to the distribution of the anopheles in the district 

 circles, which is illustrated in table X, we find the A. Fuliginosns to 

 have been the common variety in all parts of the district in the cold 

 season. A. Rossii and A. Sinensis were seldom found except in the 

 town of Dinajpur, and A. Barbirostris was only occasionally met with. 

 With regard to the malarial carrying A. Listoni it is worthy of note that 

 it was not met with in Porsa at the extreme south of the district, this 

 being also the least feverish part, nor could its larvee be found in the 

 river, which appeared to present favourable conditions for its presence. 

 In Churaman also, which is also comparatively little feverish, I failed 

 to find this variety. It would not be wise to lay too much stress on this 

 point as the distribution of this mosquito might be much more extensive 

 in the malarial season. 



Table X. — ^Varieties Found in the Houses. 





Dinajpur. 



Balughat, 



Porsa. 



Churaman. 



Ranisan- 

 kail. 



Total. 



A. Fuliginosna ... 



A. Rossii 



A. Litsoni 



A. Barbirostris ... 

 A. Sinensis 



178 



39 



6 



3 



2 



51 

 5 

 4 

 1 



103 



106 

 1 



108 



6 

 8 



646 



44 



16 



8 



2 



Total 



228 



61 



103 



107 



117 



616 



Dissection of Anopheles. — In addition to ascertaining the varieties of 

 anopheles present in the houses it is also necessary to find out by means 

 of dissections and microscopical examinations of the salivary glands for 

 sporozoits which varieties are actually carrying infection. For this 

 purpose 138 anopheles caught in the houses in Dinajpur were examined 

 for sporozoits, but none were found. Nearly all of them were A. 

 Fuliginosus, which was never found to be naturally infected by the 



