68 
Mansonia.- —Observe that the eggs have a curious 
snout-like projection, and that they are laid singly. 
Psorophora. —The eggs are large, two mm. long. 
They occur in patterns like those of Anophelines. The 
eggs are covered with minute prickly scales. 
Anophelinae 
Anophelinae. —The ova of Anophelinae 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 07 to I'o 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). 
