6-i Journal New York Entomological Society. [Vol. xiv. 



4. Honey, on the contrary, has a retarding, interrupting, or at 

 least neutral effect upon oviposition. The same is true of other sweet 

 liquids and vegetable food. 



5. With certain mosquitoes, in captivity, we have the power to 

 prolong life and suppress oviposition, or bring about prompt oviposi- 

 tion by witholding or supplying blood as food. 



6. It is a fact that in previously fertilized females of Stegomyia fas- 

 ciata the faculty of laying fertile eggs can be preserved latent during 

 periods of from 23 to 102 days and called to life at pleasure by 

 changing the diet to one of blood. 



7. In other words : A diet of honey is of advantage to the indi- 

 vidual by prolonging life, but of disadvantage to the species, for it re- 

 tards reproduction. A blood diet, on the contrary, is prejudicial to 

 the individual, for it shortens life, and most advantageous to the spe- 

 cies, as it favors reproduction. 



8. We have the right to call blood an indispensable factor in the 

 production of fertile eggs. By the above experiments, what has so far 

 been only a hypothetical supposition, has now been definitelv proven. 



9. Unfertilized females, bred in captivity and in strict isolation, 

 readily accept blood. Copulation is not a necessary preliminary to 

 enable the female to practice heematophagy. 



10. These unfertilized females of Stegomyia may lay eggs, though 

 these are not fertile and do not produce larvce. 



11. Oviposition completed, the female, both of Stegomyia and of 

 Culexfatigans, dies in the following days, in most cases immediately 

 afterward. The female survives in cases where oviposition is incom- 

 plete until the fractional deposits have made up the total. 



12. In order to make a complete deposit of eggs it is necessary that 

 the female of Stegomyia should have several successive rations of blood, 

 at least two or three. With Culex fatigans the results on this point 

 have not been equally decisive. 



13. The respective interval between the meal of blood and oviposi- 

 tion, taking the average, for Stegomyia fas data is 3.7 days = 88.8 

 hours, and for Culex fatigans 3.5 days = 84 hours. 



14. The interval from the time the eggs are laid to the appearance 

 of the larvae, taking the mean, is, for Stegomyia fasciata, 4.5 days 

 = 108 hours, and for Culexfatigans 1.8 days = 43.2 hours. 



The second chapter closes with an extensive account and discussion 

 of the habits of Stegomyia fasciata, which clearly demonstrates that this 



