502 NORTH AMERICAN FAUNA. [no. 27. 



In the spring of 1904 H. W. Jones heard the notes of this frog 

 beside the Mackenzie above Fort Simpson on April 22. I heard 

 the first ones in the vicinity of the post April 28, when I took 

 three specimens. At this time the ponds were still frozen to the 

 bottom in most places, but had thawed in the more exposed parts. 



Chorophilus septentrionalis Boulenger. Northern Chorophilus. 



This little frog, whose trilling notes are exactly similar to those 

 of the more southern forms of the genus, is fairly common nearly 

 throughout the region. The name was based on specimens taken on 

 Great Bear Lake. 



We took the species at the following localities: Twenty-five miles 

 north of Edmonton ; Slave River, 25 miles below the Peace ; Smith 

 Landing; and Fort Resolution. At Fort Simpson I first heard its 

 notes on May 3, 1904, but failed to take specimens. I heard it also on 

 the Mackenzie above Fort Norman early in June. 



FISHES OF THE ATHABASKA-MACKENZIE REGION. 



The following list includes practically all of the species of fresh- 

 water and anadromous fishes known to occur in the Mackenzie Val- 

 ley. It is based primarily on a collection made in the summers of 1903 

 and 1904. As my time was mainly occupied in other work, the col- 

 lection of fishes was far from complete, some common species being 

 purposely not preserved, while lack of facilities for their capture 

 prevented the acquisition of small species, with a few exceptions. 



By some unfortunate accident a considerable portion of the collec- 

 tion disappeared in the interval between its arrival in Washington 

 and the time when it could be examined. These lost specimens unfor- 

 tunately included most of the examples of Goregonus — specimens 

 which would have settled a number of doubtful points — from widely 

 separated localities, some of them remote from the linos of regular 

 travel. The remainder of the collection has been identified by Barton 

 W. Evermann and Edmund L. Goldsborough, and the records in- 

 corporated in their recent Check List of the Freshwater Fishes of 

 Canada, published in the Proceedings of the Biological Society of 

 Washington. In view of the fact that so many of my specimens 

 were lost before they could be examined critically, I was gratified to 

 find that the collection included a number of species not hitherto 

 recorded from the Mackenzie Valley, and one which is new to the 

 fauna of Canada. 



Collections of fishes from the Mackenzie region have been singu- 

 larly unfortunate. A part of the first collection ever made there, 

 those specimens taken on Sir John Franklin's first journey, had to 

 be abandoned during the disastrous retreat of the expedition across 



"C;il. Batr. Salientia Brit. Mus., p. 336, 1882. 



