Notes on the Commoner Species 165 



to November 13; in New Jersey from early May 

 to October. There are several broods in a 

 season. 



Ochlerotatus canadensis. — This species breeds 

 in the larger pools and bodies of water in the wood- 

 surrounded bogs of the eastern half of the United 

 States. We found it at Baton Rouge in the willow 

 pool on the campus, along the edges of the bayou, in 

 woodland pools and in springs. It does not like foul 

 water. Specimens in the adult stage were taken at 

 Baton Rouge from April 18 to June 4; Dr. Smith 

 took them from April 27 to as late as September 21, 

 the greatest abundance being in May ; and new 

 larvae in February and in November. The species 

 hibernates in the egg stage. Dr. Smith states that 

 the eggs will hatch in water just above the freezing 

 point, and during a spring freeze the larvae will hide 

 in the mud. They never seemed to come into the 

 city in Baton Rouge, but did plenty of biting along 

 the bayou, though the porches of a house not far 

 away were practically free from them. They fed once 

 and laid one batch of from thirty to seventy-five 

 single eggs from four to seven days later. The ova 

 usually hatched in about twenty days, but some, de- 

 posited in April, lay under water until the 20th of 

 the following March before hatching, when agitation 

 caused the larvae to appear. The larval life is about 

 seven days, the pupal two. Adults did not survive 

 over eight days in captivity. 



Melanoconion melanurus. — This form occurs 

 only in New Jersey and northward, where it is found 

 in swamps, woodlands, and springs, in clean water. 



