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structure. This is striated in appearance, but 

 portions of it may (in some species) be free 

 frpni striations. In other species the appearance 

 is rather that of a white striated rim. In all 

 species of Anopheles ova yet described, a striated 

 frill or rim is present. The width and extent of 

 the frill vary in different species. 



Type I. — Ova have the upper surface very 

 narrow, with the lateral floats not touching the 

 margin (Fig. 54 : i). 



The species with ova of this type are — 

 M. barbirostris M. culicifacies 



M. sinensis M. listoni 



A. bifurcatus 



Type 2. — Ova having a more or less broad 

 upper surface, with the lateral floats touching the 

 margin (Fig. 54 _: ,2, 3, 4, and 6). 



Species having ova of this type are — 

 M. rossii N. fuliginosus 



Ce. pulcherrima N. stephensi 



A. niaculipennis A. algeriensis 



Type 3. — Ova with no floats, and with upper 

 surface rudimentary (Fig. 54 : 5). 



One species only as yet described has ova of 

 this type, viz. : — 



M. turkhudi 



Species having ova of the first type have in 

 all cases been species breeding in either open 

 natural wate'rs or running streams. 



Species with ova of the second type are in 

 general found breeding in pools. 



The only ova as yet systematically described 

 are those of the Indian Anophelines. Further observa- 

 tions will probably add further types to the above. 



