26 Cary — Some Unrecorded Colorado Mammals. 



not at all common, but a considerable number of nests were found on the 

 cactus-covered bench, or table, on the south side of White River, at 5,300 

 feet. 



Reithrodontomys megalotis (Baird). 

 A series of twenty-six bar s'est mice from Gnind Junction are referable 

 to this species. All but one were collected by A. H. Howell, early in No- 

 vember, 1895, and are in early winter pelage. The other sjiecimen, 

 secured by E. A. Preble, August 25 of the same year, is in the bright, ful- 

 vous summer coat. 



Microtus (Lagurus) pauperrimus (Cooper). 



Several ill-defined ruuways, and other evidences of a small species of 

 Microtus — presumably a Lagurus — -v\' ere detected on the sage plains in 

 the eastern part of North Park in July, 1905. During the same month, 

 three specimens were trapped in the sand hills at the west base of the 

 Medicine Bow Mountains, east of Walden. In August and September, 

 1900, fourteen specimens of this species were collected at the following 

 localities: Canadian Creek, east of Walden, North Park; eiglit miles 

 south of Lily, Routt County; four miles east of Toponas, Egeria Park. 

 The bleached anterior portion of a skull was found in a wood rat's nest 

 near Douglas Spring, at the north base of the Escalante Hills. The 

 species may have a general range over the sage plains of northwestern 

 Colorado, but thus far has been found only in widely separated colonies 

 between 6,000 and 8,500 feet altitude. 



Doctor Allen has recorded the species from Kinney Ranch, Sweetwater 

 County, Wyoming, * within 30 miles of the Colorado line. 



Thomomys clusius ocius Merriam. 



This is the pocket gopher of the sage plains of western Routt and Rio 

 Blanco counties. It is represented in the Biological Survey collection by 

 eight August and September specimens, from the following localities : 

 Bear River, south of Lay, Routt County ; Snake River, 15 miles northeast 

 of Sunny Peak ; Ladore, Browns Park ; Elk Springs, 8 miles south of 

 Lily; and Lily. Part of a weathered skull was found at Douglas Spring. 

 The high escarpment of the Book Plateau probably forms the southern 

 boundary of the dispersion of this species. 



Thomomys aureus pervagus Merriam. 

 Eight specimens from Antonito, and two from Conejos River, in the 

 southern part of the San Luis Valley, collected in September, 1904, accord 

 well with this form, the tyj^e locality of which is Espanola, Santa Fe 

 County, New Mexico. The altitude of Antonito is a little over 8,000 feet. 



Thomomys fulvus (Woodhouse). 

 A specimen of this species from Fisher Peak, southeast of Trinidad, Las 

 Animas County, was collected by A. H. Howell, September 15, 1903, at an 

 elevation of 8,000 feet. 



*Bull. Am. Mus. Nat. Hist., VIII, p. 248, 1896. 



