24P 



due to collections of air are seen beneath the 

 cuticle. 



Pupae taken out of the water and kept on 

 moist blotting-paper will still develop into winged 

 insects (Nuttall and Shipley). 



Egg to Imago. — The developmental cycle for A. maculi- 

 pennis is about thirty days at a temperature of 20''-25° C. ' In 

 the tropics it is much less. Thus the minimum time for Ce. 

 argyyotarsis, M. rossii, M. culicifacies is fourteen days. 



