98 



MOSQUITOES 



mmm 



resembled by the Anopheles oviiDositions, and the indi- 

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

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

 illustrated for comparison with Fig. 7. In Culex from 

 200 to 400 egg-s are laid in a mass ordinarily shaped like 

 a pointed ellipse, convex below and concave above, 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 upon 

 the surface of the water, each cg^ 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 they 



naturally float close to each 

 other, and there are from -40 

 to 100 eg-gs in each lot. In 

 CuJc.r, 2^itnr/rns the individual 

 egg is 0.7 mm. long and O.IC 

 mm. in diameter at the base. 

 It is slender, broader, and 

 blunt at the bottom, slenderer 

 and more pointed at the tij). 

 The tip is always dark grayish 

 brown in color, Mdiile 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 beloAv, it is dark in 

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



Fio. 17. — Individual Egt^s of 

 Anopheles maculipennis, from 

 below ul left, from above at 

 right ; greatly enlarged. (Au- 

 thor's illustration.) 



