A nopheles^rossi. 



inner end of the costa are very small, and may be more or less 

 united together. 



The first long vein shows five dark spots : the outer four of 

 these have a similar situation to the outer four on the costa ; the 

 fifth lies close to the inner end of the vein. . 



The second long vein has two dark spots before its bifurcation. 

 There are, as a rule, two black-scaled spots on each of the two 

 branches into which this vein divides. 



The third long vein has three dark spots, all small in size. 



The fourth long vein has two dark -scaled portions before its 

 bifurcation, and on each of its branches there are two dark spots. 



The fifth long vein, before it bifurcates, has one dark spot ; 

 its anterior branch has three dark spots, while the posterior has 

 only one. 



The sixth long vein has two dark spots one near the middle, 

 the other near the termination of the vein. 



The distal extremity of all the wing veins is light-scaled and 

 at these points the wing fringe is interrupted by light scales. 



The legs are of a brownish hue and show lighter scaled spots 

 of a yellowish colour at the distal extremities of the femur, tibia, 

 and all the tarsal segments except the last. The marks on the 

 tarsi are at the joints between the segments. The marks on the 

 tarsal joints of the hind legs are smaller than those on the other legs. 



The chief variations to be found in this mosquito are : 



1. Variations in the number of costal spots. This is brought 

 about by the union of one or more of the normal costal spots, 

 especially those situated near the base of the wing. Other minor 

 differences are to be found in the number and arrangement of the 

 dark areas in other parts of the wing field. 



2. There is occasionally a tendency to mottling on the femur 

 and tibia, but this is always indistinct as compared with stephensi. 



3. The markings on the tarsi may be more distinct in some 

 specimens than in others. 



4. Like many other " anopheles " the relative position of the 

 transverse veins to one another is variable. 



Characters of the eggs and larva (PL VI, Fig. 1). The eggs 

 of this species are characterised by having a very broad deck 

 surface and by the presence of a broad fringe passing all round the 



no] 



