110 INSKCUTOR INSCITI^ MENSTRUUS 



A'edes idahoensis Theobald. Twenty-three males and 19 

 females. 



A'edes aldrichi Dyar & Knab. Sixty females. 



A'edes vexans Meigen. One hundred and fifty-six females. 



A'edes cinereus Meigen. Five females. 



A'edes curriei Coquillett. Forty-two males and 654 females. 



A'edes nigromaculis Ludlow. Thirty-eight males and 726 

 females. 



A'edes sansoni Dyar & Knab. One female. 



A'edes trivittatus Coquillett. Thirty-eight females. 



A'edes sp. One female. A black-legged species of large size, 

 too much worn to identify. 



Psorophora signipennis Coquillett. Three females. 



A number of pools formed by seepage from irrigation 

 ditches on the prairie contained larvae and pupse of A'edes 

 curriei, vexans, nigrotnaculis, and trivittatus, of which 124 

 specimens were bred. 



The above collections show relative abundance as follows : 

 A. nigromaculis first with 832 specimens, curriei second with 

 768 specimens, idaho'ensis third with 550 specimens, and vexans 

 fourth with 434 specimens. It almost seems as if Mr. Parker 

 must have accidentally transposed the labels on his determined 

 idahoensis and spencerii, for I got only two of the latter, while 

 the former was one of the common species. Except for this 

 discrepancy, I find the same species abundant as does Parker. 

 The relatively different order is largely accidental. In a gen- 

 eral way, curriei is the most widespread and abundant species. 

 My collections were influenced by a local abundance of nigro- 

 maculis at Laurel. Similarly, idaho'ensis is more abundant in 

 western than in eastern Montana, and my collections plainly 

 have a larger western proportion than Parker's, as I did not 

 collect east of Laurel, which is near the middle of the State. 



THE SPECIES 

 Aedes curriei Coquillett. 



A widespread species, especially on the prairie. The colora- 

 tion varies greatly. The males swarm over bushes or promi- 

 nent objects. At Laurel, on the prairie, just at sunset, a 



< 



