■^59 



P. costalts, in Lagos itself, contained only 

 three per cent, of sporozoits. 



It is important then to determine precisely 

 the species in a district and to determine the 

 percentage of infection sporozoits. 



A.maculipennis and A. punctipennis in Amenca. 

 Both these species were fed on the same case of" 

 malignant tertian malaria by Hirshberg, and kept 

 at the same temperature — 30° C. 



A. maculipennis 

 A. punctipennis 



Number infected 



Similar results (unpublished) have been ob- 

 tained in Japan. 



Anophelinae that are known to transmit malaria. — 



Altliough we have over eighty species, it has been deter- 

 mined, only in a very few cases, which of tfiese actually do 

 transmit malaria in nature. Thus we know that the following 

 species do : — 



Europe. — A. maculipennis (mainly); A. bifurcatus (less 

 concerned). 

 P. superpictus and M. pseudopictus (in some parts 

 especially). 

 Africa. — M. funesta, P. costalis, A. maculipennis (Algeria). 

 N. America. — A. maculipennis. 

 W. Indies. — Ce. albipes (according to Pajos). 

 India. — Af. listoni, M. culicifacies, N. maculatus (?). 



LITERATURE 



Stephens and Christophers. Malarial Reports to the Royal 

 Society. Series VI and VII. Harrison and Sons, London. 



