98 



3I0S QUI TOES 



resembled by the Anopheles ovipositions, and the indi- 

 vidual eg-gs are equally dissimilar. In the accompany- 

 ing- illustration (Fig. IC) the egg- mass of Anopheles is 

 illustrated for comparison with Fig. 7. In Culex from 

 200 to 400 eggs are laid in a mass ordinarily shaped like 

 a i^ointed ellipse, convex below and concave aboA-e, all 

 the eggs perpendicular, and stuck closely together at the 

 sides by some gummy secretion, and arranged in rows. 

 The mass with Anopheles, however, is laid loosely uiDon 

 the surface of the water, each egg lying upon its side 

 instead of being placed upon its end as in the egg mass of 

 Culex. They are not attached together except that the}^ 



naturally float close to each 

 other, and there are from 40 

 to 100 eggs in each lot. In 

 Culex 2^^^nf)ens the individual 

 egg is 0.7 mm. long and 0.16 

 mm. in diameter at the base. 

 It is slender, broader, and 

 blunt at the bottom, slenderer 

 and more pointed at the tip. 

 The tip is always dark grayish 

 brown in color, while the rest 

 is dirty white. The egg of 

 Anopheles when seen from 

 above is of rather regular el- 

 liptical outline, the two ends having practically the same 

 shape ; seen from this side, it is strongly convex below 

 and nearly plane above ; seen from below, it is dark in 

 color, and when examined with a high power is seen to 



Fig. 17. —Individual Eggs of 

 AnopJieles mactiUpennis, from 

 below at left, from above at 

 right ; greatly enlarged. (Au- 

 thor's illustration.) 



