Anopheles listoni. 



The sixth long vein is for the most part black-scaled, but shows 

 two small white areas, the one at its inner extremity, and the other 

 between the two black-scaled portions. The distal extremities of 

 all the long veins, except the sixth, are white-scaled, and at these 

 points the wing fringe is interrupted by light scales. 



The legs are dark-scaled throughout. 



Variations. The following are the most common variations 



(1) the long dark basal costal spot is occasionally interrupted 

 by a few light scales about its middle ; 



(2) the length of the white-scaled area on the third long vein 

 may be considerably diminished by the encroachment of black scales 

 from either end of the vein ; indeed this vein is occasionally found 

 black throughout ; 



(3) a light-scaled interruption occasionally occurs on the middle 

 of the anterior branch of the fifth long vein ; 



(4) light scales may occasionally be found at the distal extremity 

 of the tibiae, and there may sometimes be a tendency to formation of 

 light bands at the tarsal joints. 



Characters of the larva (PI. VII, Fig. 1). The frontal hairs 

 are simple and unbranched. In addition to the palmate hairs on the 

 abdominal segments there is a well-developed pair on the thorax. 

 The terminal filament of each leaflet is short. 



The characteristic pattern on the dorsum of the head of the 

 larva is shown in the figure. 



Habitat and observations. This species occurs in the Berars 

 (Ellichpur), in the Central Provinces (Nagpur), in the Bengal 

 Duars, in the Jeypore State, in Goa, Bombay, and the Hyderabad 

 State (Aurungabad). 



It is apparently absent from the Punjab. 



Its larvae are usually to be found in clear streamlets with grassy 

 edges. It has been shown to be the carrier of malaria in the Duars ; 

 experimentally also it has been proved that the parasites of human 

 malaria readily develop in it. 



In the adult stage this species closely resembles jeyporiensis, 

 but it may be distinguished by the differences in wing markings and 

 by the fact that, as a rule, the legs have no white scales at the joints. 



Considerable confusion has arisen regarding the correct specific 

 name of this species, and it seems necessary to give the following 



[105 



