S14 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 



TAMIAS LATERALIS (Say) Allen. 

 Say's Chipmunk. 



Sciurus lateralis Say, Long's Exped. ii, 1823, 46.— Harlan, Faun. Amer. 1825, 181.— Godman, Am. Nat. 



Hist, ii, 1820, 144.— H. Smith, Giithth's G'uvier's An. King, v, 1827,255.— Wagner, Schrebor*8 



Sauget. iv, pi, ccxiv, B. — Fischer, Synop. Mam. 1820, 350. 

 Arclomys (SpermpMhu) lateralis Richardson, Zool. Journ. iii, 1828, 519; Fauna Bor.-Am. i, 1829, 174, 



pi. xiii. 

 Spcrmophilu* lattialis "F. Cuvier's Suppl. Buffon, i, Mam. i, 1831, 335".— Wagner, Suppl. Scbreber's 



Sauget. iii, 1843, 252— Brandt, Bull. Classe Physico-math. Acad. St. Pctersb. ii, 1844, 380.— 



Audubon & Baciiman, Quad. N. Am. iii, 1853, 62, cxiv.— Giebel, Sauget. 1855, 638.— Baird, 



Mam. N. Am. 1857, 312, pi. xx, fig. 3 (bead and feet); pi. xlv, fig. 5 (skull).— Cooper, Proc. 



Cal. Acad, iv, 1869, 4.— Merriam, U. S. Geol. Surv. Terr. 6tb Ann. Rep. 1873, 664. 

 Tamias lateralis Aij.en, Proc. Bost. Soc. Nat. Hist, xvi, 1874, 290.— Coues & Yarrow, Wheeler's Expl. 



and Surv. West of 100th Merid. v, Zool. 119 (Apache, Arizona).— Hensuaw, Ann. Rep. Chief 



Engineers for 1876, App. JJ, 1876, 311 (Southern California). 



Specific chars — Largest of* the genus. Length of head and body 7.25 to 

 8.00; of tail to end of vertebrae about 3.25; to end of hairs 4.35. Above, yellow- 

 ish-gray, with two broad stripes of white and four of black, which extend from 

 the shoulders to the hips. No central dorsal line. Sides of neck and shoulders, 

 and often the whole upper surface of the head, dark rufous or chestnut, varying 

 greatly in intensity in different specimens ; posterior edge of thighs and sides 

 of rump also rufous, but paler than the sides of the neck and shoulders. 

 Beneath, yellowish-white, the yellowish tint strongest on the breast. Eye- 

 lids white, with an indistinct pale ocular stripe. Tail above, blackish, varied 

 with whitish and edged with pale yellowish ; middle of the tail below, pale 

 yellowish-brown, varying to reddish-cinnamon and chestnut, with a subter- 

 minal bar of black and yellowish-white edging. 



The present species varies greatly in color, even among specimens from 

 the same locality. The light stripes on the sides of the back range from 

 nearly pure white to pale yellow; the black stripes by which they are enclosed, 

 from pale brownish-black to intense black. Of the dark stripes, the outer is 

 generally considerably broader than the inner; sometimes they are equal in 

 width ; the inner is occasionally entirely obsolete, and in about one-third of 

 the specimens before me is less than one-fourth the width of the outer and 

 much shorter, while in rare instances it is considerably wider than the outer. 

 Occasionally the stripes are all only indistinctly indicated. The general color 

 of the upper surface varies from whitish-gray to reddish-gray. In some speci- 

 mens, the head and neck are scarcely more rufous than the back ; in others, 

 the upper surface of the head is much more strongly rufous than any other 

 portion of the animal. To describe these variations more in detail: — No. 



