Characters of Anopheles eggs. 



(3) The rim or frill. It should be noted whether the rim is 

 wide or narrow and whether the floats appear to arise from it, or 

 whether they arise behind it, in which case it would be continued 

 uninterruptedly round the upper surface of the egg. 



(4) The lower surface. It should be noted whether the lower 

 surface is smooth and uniformly coloured, or whether it is marked 

 with silvery lines dividing it into a number of polygonal areas. 



Fig. 8. (After Stephens and Christophers. 



1, A. culicifaeies ; 2, A. pulcherrimus ; 3, A. rossi ; 4, A. stephensi : 5, A. turkhudi ; 

 6, A. maculipalpis. 



The following types of " anopheles" ova have been described 

 by Drs. Stephens and Christophers : 



Type 1. Ova having the upper surface very narrow, the rim or 



frill being continued uninterruptedly round this surface 



and the lateral floats not touching its margins (Fig. 8, 1). 



Some species with ova of this type are : A culicifacies, A. 



listoni, A. barbirostris, A. nigerrimus. 



Type 2. Ova having a more or less broad upper surface with 

 the lateral floats touching its margins and apparently 

 arising from the frill (Fig. 8, 2, 3, 4, 6.) 



[39 



