220 



tion is said only to occur after the first meal of 

 blood. Annett and Button describe many hun- 

 dreds of male Anophelines dancing together in 

 midge- like fashion in the villages at dusk. 



Fecundation 



Fecundation takes place it is thought gener- 

 ally on the wing. It is also effected in captivity 

 when the Anophelinae are confined in test tubes. 

 In the case of Stegomyia, Low describes fertiliza- 

 tion as taking place soon after the flies emerge 

 from the pupae. 



Proportion of Males to Females of Reared Insects. 

 One is often struck by the large proportion of 

 males among mosquitoes artificially raised, a 

 troublesome fact when feeding experiments are 

 being conducted. According to Berkeley, if the 

 larvae are kept supplied with abundant food the 

 proportion of males is much reduced. 



