212 



species (Pyret. cineveus) in April (Theobald, 

 Monograph of the Culicidae, p. 99). 



Pyretopherus chaudoyei. — ' In the winter up to 

 June one only sees C. pipiens. These then dis- 

 appear and Pyret. chaudoyei appears ' (Theobald, 



P- 70)- 



The incidence of Pyret. chaudoyei is said to be 



accompanied by the recrudescence of severe 



malaria, but it ought also to be definitely shewn 



that sporozoits are present in this species, and 



presumably that the sporozoit rate increases with 



the outbreak of malaria. 



The Hibernation of Anophelines 



I. Hibernation of the Adult Insects. Annett 

 and Button describe the finding of A. maculi- 

 pennis during the winter in England in cellars, 

 lumber-rooms, and other cold places, but not in 

 stables where the temperature is higher. 



They observed the following points : — 



(i) The attitude is peculiar, the insect lying 

 quite flat upon the surface with its legs spread 

 out. In this position the under surface of the 

 thorax touches, or nearly touches, the wall. 



(ii) Only females are found, and these are 

 always fertilized, and have the spermatheca filled 

 with spermatoza. 



(iii) The insects are difficult to arouse, and 

 very sluggish in any movements they make. . 



(iv) They do not feed unless the temperature 

 is raised. If kept at a low temperature (provided 

 the air is moist) they remain for weeks without 

 feeding. 



(v) If roused by raising the temperature they 



