THE COMMON AND MALARIAL MOSQUITOES 65 



veins. Does the wing bear any scales? Where are the 

 scales borne ? How does this compare with the wing of a 

 butterfly? With the wing of a locust? Note the shape 

 of the wing. 



Make a drawing of a wing showing the veins and scales. 



Draw the heads of male and female with appendages. 



Note that the body is clothed with scales. Note the long, 

 slim abdomen. How many legs has the mosquito ? How 

 do they differ from those of the grasshopper ? 



C. STUDY OF THE MALARIAL MOSQUITO, ANOPHELES. 

 Malarial mosquitoes usually breed in ditches, in road- 

 side pools of water, or in other clear pools, seldom, if ever, 

 in foul pools. The larvae of Anopheles lie horizontally 

 just beneath the surface film. They may be collected and 

 the adults reared in the same manner as those of Culex. 



Compare the positions, habits, and movements of the 

 larvae with those of Culex. Note that the head of the Ano- 

 pheles larva is turned half way round when the larva is 

 feeding. Note how quickly the head is turned to its normal 

 position when the larva stops feeding. Do the larvae have 

 any markings on the abdomen? How long before they 

 transform to pupae? How do the pupae differ from those 

 of Culex? Note the short, wide, respiratory tubes. How 

 long before the pupae transform to adults ? 



Compare an adult female with an adult female Culex. 

 Compare the heads of the two females. How many ap- 

 pendages on the head of the Anopheles? How many on 

 the head of Culex that are conspicuous? Compare the 

 positions assumed by the adults of Anopheles and Culex 

 when they alight on the side and top walls of the cages. 

 Make a summary of all the differences between the larvae, 

 pupae, and adult females of these two species of mosquitoes. 



HERRICK LAB. EX. 5 



