218 
is recognizable at the frst glance on account of its very character- 
istic sipho, which has been converted into a piercing organ by 
means of which the animal perforates living plant-tissues; the air 
Fig.1. Fully grown larva. 
in the airrooms is used for respiration. The mode of life of the 
larva is therefore quite different from that of the other mosquito 
larvæ; it does not swim but, really, has to be regarded almost as 
a sedentary animal, sitting with the sipho bored into the plant-tissué 
