THE COMMON MOSOUITOES OF MIXNESOTA 89 



white. The thorax is marked on the posterior halt with two narrow 

 white lines and a white spot on the posterior ediie. Thev bite 

 readily at night. 



In the arid regions of North America this species is the domi- 

 nant form. It occurs from the Pacific coast eastward across the 

 Mississippi river, and southward into Mexico. It seems to be fairly 

 common in Minnesota. 



The larvae are said to occur in the edges of ponds and lakes 

 where thev are protected by a thick growth of vegetation but occa- 

 sionally they may breed in artificial collections of water. The 

 adults are supposed to hibernate. 



The larva is rather slender; the tuft of hairs on the antennae is 

 at the apical third of the length ; the breathing- tube is slender, a 

 little over four times as long- as broad ; the spines on the tube, 

 twelve to fifteen in numl^er, are small with the base bearing seevral 

 long teeth. The eighth abdominal segment bears a triangular 

 patch of from thirty-two to thirty-five scales, each illiptical, bearing 

 a long terminal spine and a fringe of small spines on the apex. 



We have taken these mosquitoes as follows : 



Larvae. 



University Farm — In collections of water in cattle footprints 

 iiear a watering trough; tin buckets and rain l)arrel, August 13. 

 1913; August 26, 1^T3; August 18, 1916. Adults were reared from 

 these. 



Adults. 



Adults were collected several times in Minneapolis and at Uni- 

 versitv Farm in August and September, 1916, but no more definite 

 date record made. In the Department collection are two specimens 

 liearing the date August 25, 1896. but no locality lal)el. 



Aedes trivittatus Coq. — The Three-Striped Mosquito. 



These mosquitoes may l)e quickly recognized by the three dark 

 stripes on the yellowish thorax. The legs and beak are unhanded. 

 On each side of the abdominal segments is a white basal spot. 

 These may frequently unite dorsall}- and form a narrow white 

 band. It is a fierce biter but is never seen in a house, being found 

 nrincipallv in woodland or near woodland. 



The larvae breed in woodland pools, protected by shade or 

 kept full bv small springs. Headlee says that in New Jersey it is 

 also found in company with larvae of Aedcs sylrcsfns in open 



