68 



Mansonia. Observe that the eggs have a curious 

 snout-like projection, and that they are laid singly. 



Psoropbora. The eggs are large, two mm. long. 

 They occur in patterns like those of Anopbf lines. The 

 eggs are covered with minute prickly scales. 



Fig. 23. Egg Raft and Eggs of Taeniorhynchus 



ANOPHELINAE 



Anofhelinae. The ova of Anofhelinae are difficult 

 to detect in nature, but may be seen by the aid of a lens 

 on the margins of small pools, where larvae abound. 

 They are about 0*7 to 1*0 mm. long. 



1. Confine some female Anophelines as described 

 on p. 190. Endeavour to choose those in which the 

 ovaries are nearly mature (p. 113). Fifty to one hundred 

 and fifty eggs are laid. Remove the piece of paper upon 

 which the ova have been deposited and place this upon 

 a slide. Examine with a low power in strong daylight, 

 and the mirror turned off. 



2. Observe the remarkable resemblance of the 

 ova to little boats, and the presence of the two beautiful 

 oval air cells placed upon either side, acting as floats. 

 (These are absent only in two species as yet described, 

 viz., M. turkhudi -and M. azriki). Observe also the 

 presence of a white frill or a mere ribbed rim around 

 what would be the gunwale of the boat (Fig. 62). 



