Movements in water and method of feeding 



larvae do, but when engaged in feeding they are propelled slowly 

 forwards by the action of their mouth parts alone. Both kinds of 

 larvae, when disturbed, usually wriggle rapidly to the bottom of the 

 pool, where they lie motionless with their bodies extended. " Ano- 

 pheles " larvae sometimes do not wriggle to the bottom, but simply 

 extend their bodies and allow themselves to sink by virtue of their 

 weight. When rising to the surface the movements of these larvae 

 are much more jerky than those of " culex." 



" Anopheles " larvae feed just beneath the surface film, and, 

 whilst feeding, the head is rotated so that its ventral surface 

 lies uppermost, though the body of the larva remains in its 



Fig. 2. 



original position. This rotation of the head is very character- 

 istic and is peculiar to the larvae of this kind of mosquito. 

 " Culex " larvae often feed at the bottom of a pool, moving along 



