1 88 Mosquitoes 



after feeding, and are evidently the hibernating 

 form. Hatching took place in from ten to thirty- 

 one days, the larval period extending over about 

 eleven days. The larvae were frequently found in tree 

 holes, usually accompanied by PsoropJiora. I have 

 found them thus also at Washington. They are 

 bottom feeders, grubbing about voraciously. The 

 pupal stage is two or three days. The life of the 

 adult in captivity is about fourteen days. They 

 seem to breed all summer around Washington, but 

 cannot be considered troublesome. 



Ochlerotatus pretans. — This species we found 

 but once in Baton Rouge. A few were taken near 

 the wood, February 13. Eggs laid that day hatched, 

 and the pupa emerged fourteen days after. The 

 pupal stage lasted two or three days. The male 

 imagoes, as is often the case, issued the day before 

 the females. The females fed the fourth day and 

 again on the tenth. Judging from the eggs, this 

 species, in the more northern part of the country, 

 must winter in that stage. It is found in the north- 

 eastern part of the country. Although a biter, it is 

 sufficiently rare not to be classed as a nuisance. It 

 breeds in rather out-of-the-way woodland pools. 



Ochlerotatus subcantans. — This form, com- 

 monly called the brown woods mosquito, is found 

 from Canada to the Gulf of Mexico. It also has a 

 general distribution in the west. It was taken in 

 Baton Rouge in the woods, along with canadensis, as 

 early as April 22, but did not seem to occur after 

 May, which is also the case in New Jersey. There 

 appears to be but one brood, the species hibernating 



