OF WASHINGTON. 



219 



larly-placed eggs, appearing as if they had been laid^while the 

 mosquito was in a weak or dying condition. 



Eggs of No. 3 were found hatched on the morning of the Sth, 

 and a few of those laid by No. i hatched the morning of the 

 loth. For the first few days the larvas were fairly active and 

 wriggled in a leisurely fashion, although seldom coming to the 

 surface. On one occasion, a few days after their hatching, they 

 were noticed at the surface, but when disturbed did not soon 

 return. Some of them lived for ten clays or longer, -but did not 

 pass beyond the first stage and became more and more sluggish 

 until their death. 



The egg-mass, egg and larva may be described as follows : 



FIG. 4. Larva of Culex perturbtins , first stage, and enlarged air-tube. 



Egg-mass. Floating on the surface of the water, boat-shaped, some 

 what pointed at one end, broad and truncated at the other, widest near 

 the middle;* containing about 150 eggs adhering loosely together and 

 resting perpendicularly on the water on their larger end, thus making the 

 mass narrower above than beneath. 



Egg. Resembling that of C. pipiens, narrowly conical, broad and flatly 

 rounded at the micropylar end, narrow and bluntly pointed at the other. 

 At first pale whitish in color, afterwards becoming brown-black. Surface 

 covered with small granules of varying size, those at the small end largest 

 and perceptibly denticulated. Length .8 mm., greatest width .2 mm. 



* It is altogether probable, of course, that different egg-masses laid by 

 this species will be found to vary considerably, not only in shape but also 

 in the number of eggs they contain. 



