68 



Chapter VIII 



THE OVUM 



Ova are minute bodies one mm. or less in 

 length. When first laid they are white in colour, 

 but become rapidly brown or black. They occur 

 on the surface of water, arid if submerged do not 



1^ 



Fig. i6. Eggs of Stegomyia 



hatch out. Mosquito eggs may be laid by the 

 edge of water, or on floating objects, or upon the 

 water. In the last case, they have some device to 



Fig. 17. Egg Raft and Eggs of Culex 



ensure that they shall float, and not sink and be 

 destroyed. In the case of Anophelines and some 

 species of Stegomyia (Fig. 16), each ovum lies 



