SUIUHIDJ5— UYNOMYS COLUMBIAN US. 



907 



of Central Colorado, and has been met with at Fort Massachusetts, New 

 Mexico, near the sources of the Arkansas (Cooachitope Pass), and the San 

 Francisco Mountains in Arizona. It has also been reported by Drs. Cones 

 and Yarrow from Panquitch Lake and Dog Valley, Middle Utah. I have 

 reason to believe that it occurs at irregular intervals throughout the Great 

 Basin to the Sierra Nevada Mountains. I have seen no reference to its 

 occurrence to the eastward of the eastern foot-hills of the Rocky Mountains. 

 I found it, in 1871, in South Park, at an elevation of about 10,000 feet, 

 and thence eastward nearly to the edge of the Plains, where it is immedi- 

 ately replaced by C. luclovkianits In Colorado, I found the last named 

 common on the plains at the very base of the foot-hills from Colorado City 

 to Denver, and C. columbianus common at all favorable points from South 

 Park eastward to the base of Pike's Peak. It differs quite notably in habits 

 and in the character of its burrows from the species of the Plains, its burrows 

 being unprotected by a raised funnel-shaped entrance, so characteristic of 

 those of the latter. The best account of its habits thus far published is con- 

 tained in the short notice given by Lewis and Clarke, already quoted. 



Table CXXX. — Measurements of eighteen specimens of Cynomys columbianus." 



1 Measurements all taken by myself in tin' held from specimens iu the tlesh. 



