492 



Malaria 



is capable of swimming vigorously to escape. In about three days 

 the imago issues and is ready to fly. Anopheles do not fly great 

 distances; a few hundred yards is the common range of their activi- 

 ties. They do not always return to the same pools from which 

 they issued, any similar pool or stream is good enough for ovi- 



Fig. 195. — Method of withdrawing the digestive tube of the mosquito for 



study (Blanchard). 



position. After having deposited the first lot of eggs, the female 

 is ready to feed again and produce a new lot. This can go on for 

 a number of broods. How long the insects can live, probably de- 

 pends upon their activities. When actively engaged in reproductive 

 activities they probably live a shorter time than when hibernating 



Fig. 195. — Method of withdrawing the salivary glands of the mosquito for 



study (Blanchard). 



or estivating. It is known that some of them can live the greater 

 part of a year. 



The mosquitoes used for study and for classification should be 

 mounted dry in the usual way well known to all entomologists. 



Fine entomologic pins (00-000) should be employed for the purpose. The 

 insects should be caught in a wide-mouth bottle containing some fragments 

 of cyanid of potassium, covered with a layer of sawdust, over which a thin 

 layer of plaster of Paris is allowed to solidify. The insects die in a moment or 

 two, can be emptied upon a table, and the pin carefully thrust through the central 



