SCIDUID^— CYN0MY8 COLUMUIANU8. 



dl)l 



()!' Cciilnil Colorailt), uiiil lias been met with nt Fort MuswiclniHctts, New 

 Mexico, near the sources of (lie ArkiinHns (Co(mcliit()|ic Push), and llic 8an 

 Francitioo MouiitainH in AriKonn. Il Iuik uUo Ijcumi re|H)rte(i liy Drn. Cones 

 and Yarrow from I'anriuilcii Laito and Dog Valley, Middle lltali. 1 Imve 

 reason to believe lliat it occurs at irregular intervals throngliout the Oreut 

 Basin to the Sierra Nevada Mountains. I have seen no rcti-rencre to itM 

 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 fei^t, 

 ond thence eastward nearly to the edge of the Plains, where it is iniiiKiili- 

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

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

 tu Denver, and C. coluinbinnus 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 spe^:ies ulthe Plains, il.s l)urrows 

 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 an<l Clarke, already quoted. 



Tadlk CXXX. — Meatwnmtttit of eifhtait tptcimmt of Cykomyh columiiianus.* 



• HoHORinenU all taken by myatlf iu Uio fleld Ihini aimlmona in lli« floah. 



