118 Nelson Description of a New Species of Lagomyx. 



on the Kuskoquim river ; he recognized them at once, and told 

 me that the species is common in all of the high mountains of 

 the Alaskan range south of the Kuskoquim as far as the base 

 of the peninsula of Alaska. In confirmation of this reported 

 range are two skins, now in the United States National Museum, 

 taken in the winter of 1882, in the Chigrnit mountains near the 

 head of Bristol bay, by Mr. McKay, which, though in shabby 

 condition, appear to belong to the same species. The three 

 skins secured by Mr. McQuesten were taken by the Indians dur- 

 ing a summer hunt, and are presumably in summer pelage, 

 although possibly taken in spring, before the molt. 



The Chigmit Mountain specimens are in winter fur, and are 

 much more ashy than those from the type locality. 



The species thus has a known range from the high mountains 

 south of Fort Yukon, in about latitude 65, southwesterly to the 

 vicinity of Bristol ba}^. Its northeast limit along this line coin- 

 cides with the same limit of Mazama inontana, and here occupies 

 the southern part of the range of Ovis dalli Its eastern exten- 

 sion remains a matter of uncertainty, but the type locality of 

 Richardson's L. princeps makes it probable that collaris does not 

 reach eastward to the mountains about the head-waters of the 

 Mackenzie. That it does not range north of the Kuskoquim, 

 along the course of that stream, was pretty definitely determined 

 by my work in that region. 



Description. The dorsal surface, including top and sides of 

 the head, is of a nearly uniform dark or grizzled-gray, with a 

 dull yellowish wash on the crown and back. On the back and 

 sides of the neck the yellowish wash is nearly or quite lacking, 

 leaving a broad collar of dull iron-gray separating the yellowish- 

 shaded areas of the head and back. This yellowish wash is 

 much more apparent on the crown and middle of back and 

 fades out at the sides, so that next the border of the white lower 

 surface the color becomes ashy-gray. Just behind each ear is a 

 small area of dull, light ashy. Below, a triangular white area 

 occupies the entire chin and throat, with its apex in front. At 

 each of the two posterior angles of this area is a yellowish spot 

 forming a slight backward continuation of the light area of the 

 throat at these points. These spots lie on the sides of the throat 

 below and a little behind the ears. The white-throat area is well 

 defined, and is succeeded by a distinct band of dull gray, which 

 forms the lower part of the cervical collar. The remainder of 



