firmly on the coverglass so as to rupture the sperma- 

 theca. Examine under one-twelfth inch. 



Observe the masses of fine hair-like actively motile 

 bodies, if (as is probably the case) the mosquito has 

 been fertilised. Isolate some of these ; they possess 

 the characters of spermatozoa (Fig. 47). 



Examine the spermatheca of a mosquito newly 

 hatched ; it does not contain spermatozoa. 



To EXAMINE THE OVARIES 



Observe that when the ovaries nearly reach 

 maturity they are readily detected as white areas on 

 either side of the posterior part of the abdomen, and 



Fig. 47. Spermatheca with Spermatozoa. Structure of Ovaries 



that when fully developed they occupy the whole of 

 the lateral and dorsal portions of this. 



Drag off the last few segments of the abdomen 

 in a drop of salt solution, and allow the ovaries to float 



