66 
1. Note that the raft is boat-shaped, measuring 
one-fifth to one-third inch in length, and consists of 
two hundred to four hundred eggs. 
2. Note that the separate ova are smooth elon¬ 
gated bodies, about 0*7 to o*8 mm. in length. Note 
that there are no floats or other markings as in the case 
of Ano'pheline ova. 
3. Note that one end of the egg is thicker and 
blunter than the other, and that to the thicker end is 
attached a clear transparent globular body (the micro- 
pilar apparatus). Note that this body is readily 
detached, often leaving a spike-like process projecting 
from the thicker end of the ovum. 
Fig. 21. Egg Raft and Eggs of Culex 
4. Make as many observations as possible upon 
the egg-rafts, e.g., time necessary for hatching of larvae, 
amount of desiccation they will withstand. 
Taylor, in Havana, has made many observations on eggs. He 
gives the following :— C. pipiens, raft 200-400 eggs; egg o - 9 by 
o'l6 mm. C. nigritulus , raft 200-300 eggs; egg o - 6 by 0T4 mm. 
U. lowii. raft 50-75 eggs. 
5. The egg stage in C. jamaicensis lasts twelve 
hours; in C. sollicitans , twelve hours. 
Stegomyia .—Confine some gravid females of 
Stegomyia mosquitoes. 
1. Note that in S. calopus , v. fasciata the eggs 
are laid singly, about fifty in number, and much 
resemble, at first sight, the ova of Anophelines. Note 
that in others the eggs are laid in rafts (S. notoscripta). 
