CITELLUS. Ill 



Measurements. Total length, 350; tail vertebrae, 100; hind foot, 

 59. Skull: total length, 59; zygomatic breadth, 37; length of nasals, 

 22; width of nasals at base, 5. > 



216. Citellus columbianus (Ord). 



Arctomys columbianus Ord, Guth. Geogr., 2d Am. ed., 11, 181 5, 

 p. 292. 



Spermophilus columbianus Elliot, Syn. N. Am. Mamm., F. C. M. 

 Pub., II, 1901, p. 91. Zool. Ser. , 

 Columbian Spermophile. 



Type locality. Camas prairie, between the forks of the Clearwater 

 and Kooskooskie Rivers, about forty miles from Moscow, Lincoln 

 County, Washington. 



Geogr. Distr. Western Montana to Washington and north 

 through British Columbia and Alaska to Plover Bay in Siberia. 



a. Citellus columbianus (tlbertm Allen. 



Citellus columbianus albertce Allen, Am. Mus. Nat. Hist. N. Y., 

 1903. P- 537- (Footnote.) 

 Alberta Spermophile. 



Type locality. Canadian National Park, Alberta, Canada. 



Genl. Char. Similar to C. columbianus. Skull more massive; in- 

 terorbital foramen triangular instead of circular and postpalatal border 

 more produced. 



Color. Like C. columbianus, but paler. 



Measurements. Total length, 321; tail vertebrae, 108; hind foot, 

 57. Skull: total length, 52; zygomatic breadth, 33. 



217. Citellus richardsoni (Sabine). 



Arctomys richardsonii Sabine, Trans. Linn. Soc, 1822, p. 589, pi. 28. 



Arctomys (Spermophilus) guttatus Rich., Faun. Bor. Amer., Mamm., 

 I, 1829, p. 162. (nee Temm.) 



Spermophilus richardsoni Elliot, Syn. N. Am. Mamm., F. C. M. 

 Pub., II, 1901, p. 92. Zool. Ser. 

 Richardson's Spermophile. ' 



Type locality. Carlton House, Saskatchewan, Canada. 



Geogr. Distr. From Aberdeen, South Dakota, to North Dakota 

 and Montana, west to Rocky Mountains and north to the Saskatche- 

 wan River to latitude 55°. 



218. Citellus townsendi (Bachman). 



Spermophilus townsendii Bachm., Jour. Acad. Nat. Scien. Phil., 

 1839, p. 61. Elliot, Syn. N. Am. Mamm., F. C. M. Pub., 11, 

 1901, p. 92. Zool. Ser. 



