INSECUTOR INSCITI^ MKNSTRUUS 11 



Type, female, No. 2109(i. U. S. Nat. Mus. ; Tefife [or Ega, 

 State of Amazonas, Brazil], June, 190(5 (Diicke). presented to 

 the National Museum by Mr. F. V. Theobald at the instance 

 of Dr. L. O. Howard. The specimen was included with some 

 Sabethes which we had asked for and was probably, on a cas- 

 ual examination, mistaken for one at the time. 



WESTWARD EXTENSION OF THE CANADIAN 

 MOSQUITO FAUNA 



(Diptera, Culicidce) 

 By HARRISON G. DYAR 



The Canadian fauna comprises a complex of species of un- 

 equal distribution. We direct attention to the species inhab- 

 iting the northern forests and not found elsewhere as the es- 

 sential constituents of the fauna. These species have been 

 mainly described from the extremes of distribution, where the 

 fauna touches the mountains of New York and New England; 

 but it is a well-defined fauna, centering in the forests north of 

 Lake Superior. I had carried the impression that this fauna 

 was separated from that of the Rocky Mountains by a wide 

 reach of prairie ; but that is not the fact. Explorations con- 

 ducted in the summer of 1918 show that the fauna follows the 

 forests along the North Saskatchewan River right into the 

 heart of the Rockies. The forest extends practically unbroken 

 from Ontario to the Lake of the Woods and Lake Winnipeg, 

 into which the Saskatchewan flows. The fauna, therefore, 

 passes around the prairies to the north. It passes the summits 

 of the Rockies and extends down the west slope into British 

 Columbia. I hope to make the distribution in British Colum- 

 bia the object of another exploration.^ 



Besides my own material of 8,542 specimens, collected last 

 summer, Dr. C. Gordon Hewitt has loaned me for examina- 

 tion 310 specimens collected along the Albany River in On- 

 tario. 



' See remark below under A'cdcs puUatus. 



