174 Mosquitoes 



and doubtless hibernate. They hatch in from two to 

 seven days. The larval life is about ten days, the 

 pupal one to three days, longest in early spring. The 

 adults survived from fifteen to thirty-two days. They 

 are not of great importance but may be temporarily 

 a local nuisance, as, at times, they are voracious 

 biters late in the afternoon and early in the morning, 

 especially on a rather damp day. 



Ochlerotatus infirmatus. — This species appears 

 to be southern in range, abundant only locally 

 and for very short seasons. I do not believe that 

 they migrate or even fly very far from the pools at 

 the edge of the woods where they breed. They do 

 not Lke foul water. The adults are ordinarily taken 

 at Baton Rouge from April 25 to July 26; after that 

 but few were seen. They seem to bite but once and 

 lay a batch of single ova four to six days afterward, 

 this hatching in from fourteen to thirty-four days, 

 except when it winters over. In warm weather the 

 larval stage is seven or eight days, the pupal from 

 one to three. One adult, captured December 12 and 

 fed, laid three eggs on the 20th, but died before com- 

 pleting oviposition. The three eggs, however, were 

 fertile, and their imagos were out February 7. The 

 adult will mate in captivity but will not live in con- 

 finement over four or five days. 



Uranotaenia sapphirina. — This dainty little sap- 

 phire-gemmed insect bred plentifully in pits and 

 hollows on the University grounds, as well as among 

 the plants in lily and fish ponds and where Spirogyra 

 is abundant. Adults are taken from July to Sep- 

 tember 3, and in the north it seems also to be found 



