6o 



stout proboscis. The salivary glands are very 

 large in proportion to the size of the fly, and the 

 bite is as severe as that of a mosquito-. The 

 males are harmless (Fig. 12). 



The larvae of the Simulidae are aquatic, 

 cylindrical in shape, and live in the stems of 

 water plants. The imago hatches beneath the 

 water. 



6. Psychodidae (or owl midges), e.g. Phleboto- 

 mus. — Small fluffy-looking flies which suck blood 

 readily. They are most readily detected after 

 feeding, when the abdomen is swollen with blood. 

 They have very hairy wings and body, and a short 

 powerful proboscis (Fig. 12). The larvae are 

 aquatic but can also exist in air. 



Fig. 12. Sand Fly (left). Oivl Midge (right). 



Life History of the Mosquito 



In common with all other insects shewing 

 complete metamorphosis, the mosquito passes 

 through four stages : — 



The egg. 



The larva. 



The nymph. 



The imago. 



