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 (oo-ooo) 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 



