SCIURUS. 67 



Plain-backed Squirrel. 



Type locality. Loveland, Larimer County, Colorado. 

 Geogr. Distr. Northeastern Colorado. 



135. Sciurus kaibabensis Merriam. 



Sciurus kaibabensis Merr., Proc. Biol. Soc. Wash., xvii, 1904, p. 

 129. 

 Kaibab Squirrel. 



Type locality. Bright Angel Creek, Kaibab Plateau, Grand Canon 

 of the Colorado, Arizona. 



Genl. Char. Similar to 5. aberti, but black beneath, and tail all 

 white. 



Color. Entire upper parts grizzled gray; dorsal region ferrugin- 

 eous; lower sides, upper part of arms, and thighs black; under parts 

 on middle of body black; tail with base gray ; rest white, with a median 

 buff y gray streak and black subterminal bands above ; ears in summer 

 blackish; gray with black tips in winter; hands mixed gray and 

 black; hind feet gray in summer, black in winter. 



136. Sciurus durangi (Thomas). 



Sciurus aberti durangi Thomas, Ann. Mag. Nat. Hist., 6th Ser., 

 XI, 1893, p. 49. Elliot, Mamm. Middle Amer. & W. Indies, 

 F. C. M. Pub., IV, Pt. I, 1904, p. 112, fig. 18. Zool. Ser. 

 Sciurus aberti Thomas, Proc. Zool. Soc, 1882, p. 372. (nee 

 Woodhouse.) 

 DuRANGO Squirrel. 



Type locality. Cuidad Ranch (100 miles west of Durango City), 

 State of Durango, Mexico. 



Geogr. Distr. Sierra Madre, west parts of States of Durango and 

 Chihuahua, Mexico. 



a, Sciunis durangi phcpurus Allen. 



Sciurus durangi phceurus Allen, Bull. Am. Mus. Nat. Hist. N. Y., 

 1904, p. 205. Elliot, Mamm. Middle Amer. & W. Indies, 

 F. C. M. Pub., IV, Pt. II, 1904, Appendix, p. 741. Zool. Ser. 

 La Cienaga Squirrel. 



Type locality. La Cienaga, State of Durango, Mexico. 

 Geogr. Distr. State of Durango, Mexico. Limits of rafige un- 

 known. 



137. Sciurus barberi (Allen). 



Sciurus aberti barberi Allen, Bull. Am. Mus. Nat. Hist. N. Y., 



1904, p. 207. 

 Sciurus barberi Elliot, Mamm. Middle Amer. & W. Indies, F. C. M. 



Pub., IV, Pt. II, 1904, Appendix, p. 741. Zool. Ser. 



