* SCIURIDA—CYNOMYS COLUMBIANUS. 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. Coues 
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. dudovicianus 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.* 
3 5 From tip of nose to— Tall. Dent | Length of—} EI 
a 2 3 
2 | 3 é 
3 a Locality. ; ine | e | re & 
2/2 EU MTS i Ses We es Mer et has 
+S) ° a fo) Sore |e mo| A =| 4 
| | 
2706 | 981 2.00) 245] 9.75 | 2.00 | 2.45 | 2,12 | Fresh. 
eee gga 2.04} 2.45 | 10.00 | 1.85 | 2.25 2.20 |...do. 
2707 | 984 200) 245) &70 | 210) 255 | 2.295 |...do 
Foe, 985 2.04] 2.35] 9.85 | 2.15 | 2.50 | 2.15 |...do. 
pees. 986 220/235 | 9.50/ 1.70 | 2.00 | 2.00 |...do 
2708 | 937 220/250] 9.65 | 205] 245 | 2.25 |...do 
2709 | 988 2.32} 260] 11.50 | 1.80 | 2.30 | | 2.20 |...do 
2710 | 1011 1.95.|2.35| 8.40 | 1.60 | 1.85 2.05 |...do 
2705 | 1012 2.25] 2.55] 10.15 | 225 | 285 9.15 |...do. 
2711 | 1013 2.15 | 2.50) 10.50/ 1.95 | 22 2.15 |.. do. 
2712 | 1026 2.05} 2.40} 10.00 | 2.00 | 2.50 | 2.30 |...do. 
2713 | 1027 1.85 | 215] 9.35 | 1.75 | 2.30 | 2,20 |...do. 
2714 | 1028 .. |...---| 875 | 2.00 | 2.50 2.67 |...do 
2715 | 1029 |.- 2.08} 2.43] 9.50 | 1.90 | 2.40 2.30 |...do 
2716 | 1030 2.20 | 2.50} 10.90 | 2.00 | 2.50 | 2,25 |...do 
2717 | 1031 2.15 | 245] 10.70 | 1.40 | 2.30 2.10 ...do 
2704 | 1032 : | 225/255 | ° 11.20 | 1.60 | 2.10 | | 2.20 |...do 
2718 | 1033 -++-| 1.20] 2.12 | 2.50 | 10.50 | 1.90 | 2.40 2.05 |...do. 
* Measurements all taken by myself in the field {rom specimens in the flesh. 
