THE COIVIMOX MOSQUITOES OF MINNESOTA 81 



white dots can he seen, one on each side of the thorax, near the 

 middle of its length. Immediately behind these is a U-shaped 

 white line. These markint^s are very frequently not present, mak- 

 ing- it more difficult to separate it from Ciilcx pipicus. Most refer- 

 ences to the househuld mosquito in the past have pr()l)a])lv included 

 both of these species. 



The life history and habits are \er}- similar to those of Ctilc.v 

 pipicus. The adults hibernate over the winter and jdace their 

 eggs in rafts on the water the following spring, (ieneration suc- 

 ceeds generation through the summer. Artificial collections of 

 water, small collections on the ground, holes in trees, etc., are 

 chosen for breeding places. As a rule they prefer cleaner water 

 than does Ciilc.v pipicus. In most of our collections we have found 

 the wrigglers of these two species mingled exce])t in localities 

 distant from large centers of population where Culc.v rcsfiiaus was 

 the only species found in such places as rain barrels. The adults 

 do not enter houses quite as readily as Ciilcx pipicus, Imt bite with 

 the same voracit}-. 



The larvae can I)e distinguished from the larvae of Culc.v 

 pipicus by the fact that the tuft of hairs on the antennae is at a 

 I)oint below the middle. There are a few more spines on the breath- 

 ing tube and the tracheal gills are longer and not so pointed as in 

 Culc.v pipicus. 



Wq have taken Culc.v rcstuaus in Minnesota, as follows: 



Adults. 



Universitv Farm — June 23, 1916. 

 St. Paul— June 24, 1*)16. 



Larvae. 



University Farm — August 13, 1*J16 — in water in cattle foot 

 prints. 



Monticello — August 21, 1*^16 — in rain barrel on farmstead. 



Minneapolis — August 26, 1913 — in rain barrels. 



In the departmental collections are the following records as to 

 date of capttire, but no locality is given : 



June 5, 1896; June 12, 18')6: Julv 6, 1896. 



Aedes sylvestris Theob — The Swamp Mosquito. 



This mosquito and Culc.v pipicus are the commonest moscjuitoes 

 in Southern Minnesota. In the more swampy, unsettled northern 

 portions of the state other species are more abundant, at least during 



