1 62 Mosquitoes 



ana, what might be called a midwinter form. Dr. 

 Dupree remarks that it is taken from October 1 1 to 

 April 4. It mates readily in confinement, and will 

 do so in a space one and one-half by two inches. The 

 act lasts from ten minutes to five hours. The female 

 bites from one to four times before laying the masi 

 of eggs, which will hatch even if the raft be broken 

 up. There is generally one batch, but may be as 

 many as six. On blotting-paper the eggs shrivel but 

 swell again when placed on water ; if dried more than 

 a few hours they will not hatch. When separated they 

 sink, but will come to maturity when submerged 

 without being shaken. If they are put in formalin 

 while white they will not darken. Larvae will emerge 

 at 50 F. The first eggs are laid from four and one- 

 half to eleven days after the first meal, hatching in 

 one to ten days ; in three days at 70 F., and in eight 

 at 52 F. The larval life is from ten to twenty-seven 

 days, the pupal two and one-half to four. Some- 

 times it is as long, however, as fifty-one days from 

 ovum to adult. The larvae, when very young, show 

 a tendency to gather in bunches near the surface. 

 The female dies soon after depositing. They will 

 live 38 days on dried figs with no water. They are 

 very abundant in the shrubs on the Louisiana State 

 University campus, also in the swamp. The species 

 seems to be somewhat generally distributed over the 

 United States. 



Ochlerotatus sylvestris. — O. sylvestris, comnun. 

 ly called the swamp mosquito, is found where its 

 name would indicate, in swamps and also in woods, 

 lot pools and ditches, being apparently rather adapt- 



