272 AGRICULTURAL EXPERIMENT STATION. 



the season advances, and yet provides liberally for the enormous 

 spring crop in spite of the dangers attendant upon so long- a 

 quiescent period under varying climatic conditions. This ac- 

 counts for the November larvae found by Mr. Brakeley, as prob- 

 able progeny of adults which matured in late September or early 

 October. It is assumed here that the larvse that hatch so late in 

 the season do' not reach maturity. 



Habits of the Adult. 



This is esentially a woods mosquito. It bites hard when it 

 gets a chance and readily attacks those that venture into its 

 domain, but it is easily scared off and never follows intO' the 

 open. Nor does it get into houses or even on porches, except 

 where a house is practically in the woods. It is almost never 

 found in cities, towns or villages, so, though it is really one of 

 our common species, it is not to be accounted a very troublesome 

 one. 



During the day it is not readily started, except in the darker 

 woods ; but in the early morning and at dusk it flies readily and 

 may get for a short distance away from its normal shelters. It 

 is not in any sense a migrant, however, and under ordinary 

 circumstances the adults probably never get many yards away 

 from the place where they hatched. The males live only a few 

 days ; the females seem to remain for several weeks. 



CULEX TRISERIATUS, SAY. 



The Tree-hole Mosquito. 



A small or medium sized mosquito, with black, unhanded legs 

 and beak; the sides of the thorax silvery white, grayish on the 

 dorsum, leaving a well-defined central stripe, which becomes 

 wide posteriorly. The abdomen is black, with white lateral 

 marks, encroaching upon the dorsal part at the bases of the apical 

 two or three segments. The patches on the sides of the thorax 

 are larger and whiter than in any other species. 



Description of the Adult. 



This mosquito varies considerably in size, ranging from 4 to 

 6 mm., = .16-.24 of an inch in length, excluding the proboscis, 

 which is 2-2.5 long. The occiput is almost entirely covered with 



