Anopheles Stephens 7. 



The sixth long vein has sometimes three, and occasionally 

 only two dark-scaled spots. 



The costal fringe is interrupted by light scales at the outer 

 extremity of all the longitudinal veins. 



The femora and tibiae of all the legs are speckled with white 

 scales. The distal extremities of the femora and tibiae are covered 

 with yellowish white scales. The distal ends of the tarsal segments 

 of the middle and hind legs have yellowish white-scaled bands, 

 except those of the terminal segments. In the anterior legs, the 

 second and third tarsal segments have distal yellowish-white bands, 

 and the first tarsal segment has two additional yellow-white bands. 

 The fourth and fifth segments are wholly covered with brown 

 scales. 



Characters of the larva. (Plate VI, Fig. 2). The frontal 

 hairs are simple and unbranched. The palmate hairs are borne by 

 the first to the seventh abdominal segments ; the filaments of the 

 leaflets are shorter than those of rossi, and this character and the 

 complete absence of any head pattern serve to distinguish the larva 

 of this species from that of A. rossi. 



Habitat and observations. This species occurs in the Punjab 

 (Lahore, Mian Mir, &c.), in Calcutta, in Madras, in the Central 

 Provinces (Nagpur), and at Ellichpur in the Berars. In Calcutta 

 the adults were found in native huts along with A. rossi ; in 

 Madras, it was also found in native houses, and here it was breed- 

 ing almost entirely in disused wells. In Mian Mir its breeding 

 places were found to be the tins and vessels of water which are kept 

 in the lines of native troops in case of fire. This species has not 

 been found in Bombay, but is very common in Karachi. 



It has been proved that under experimental conditions the 

 parasites of human malaria are capable of developing in this 

 species. 



A. stephenn is in many respects related to pulcherrimus and 

 willmori, but the wing and thoracic scales are not so broad and there 

 are fewer scales on the abdomen and more hairs. It can be readily 



distinguished from them by the absence of white tarsal segments 

 on the hind legs. 



Mr. Theobald has classed this species in his genus Nyssorhyn- 

 chus, but an examination of the thoracic scales, on which he lays 



114] 



