826 MONOGRAPHS OF NOliTII AMERICAN KODENTIA 



5. SlZO small ; above strongly reddish-brown, with indistinct subquadrate spots of reddish-white, 



not arranged in rows; tail very narrow, about lialf the length of the- head and body; 

 below reddish-browQ, with an indistinct narrow line of black ; ears very small, almost obso- 

 lete. Habitat, Southern New Mexico, Southwestern Texas, and Eastern Mexico.. spilosom a. 



6. In size aud general form similar to the last; above dull yellowish-brown, indistinctly spotted 



with lighter. Habitat, from the Black Hills and Fort Kearney westward to the Great 



Basin obsoletus. 



III. Skull very long and narrow, the nasal portion relatively broad aud very long; zygomatic arches 

 rather weak, not widely spreading ; first upper premolar of medium size, about one-third as 

 large as the second ; tail quite long, the vertebra alone nearly two-thirds to more than two- 

 thirds the length of the head and body ; ears small ; general form of the body long aud 

 slender ICTIDOMYS. 



7. Above yellowish-brown, finely varied with gray ; below yellowish-white ; tail cylindrical, concolor 



with the body ; ears nearly obsolete. Habitat, vicinity of Fort Yuma, Southern Cali- 

 fornia TERETICAUDUS. 



8. Above dark reddish-brown, inclining to olivaceous, with subquadrate spots of white rather regu- 



larly arranged in nine to eleven roics ; tail about two-thirds the length of the body ; beneath 

 dull brownish-yellow, with a band of black. Habitat, Southern New Mexico, Southwestern 

 Texas, aud southward into Mexico (to Vera Cruz?) mexicanus. 



9. Larger ; above dark brown, mixed with reddish, varying to pale brown and blackish-brown, with 



six to eight light continuous lines, alternating with five to seven rows of light spots ; tail 

 generally about two-thirds of the length of head and body, rather narrow; below yellow- 

 ish-brown centrally and edged with yellowish, between which is a very broad band of 



black TRIDECEMI.LNEATUS. 



a. Darker above ; the light lines rather narrow. Habitat, the prairies of the United States 



northward to the Saskatchewan var. tridecemlineatus. 



b. General color much paler, with the light lines and spots broader. Habitat, the dry plains 



and deserts westward to the Great Basin var. pallidas. 



10. Large; above yellowish-brown, varied with black, the light and dark markings forming indis- 



tinct subquadrate spots; head grayer; tail two-thirds the leugth of the head and body, 

 rather full and bushy, whitish, with three bauds of black ; ears small, but distinct. Hab- 

 itat, Northern Illinois and Missouri, northward to latitude 64° frankllni. 



Incertce tedis. 



11. (Cranial characters unknown.) Size medium ; ears large; tail with hairs nearly as long as tho 



body; form highly Sciurine; above varied yellowish-brown aud black; sides of neck and 

 shoulders aud outer side of limbs strongly reddish-brown ; beneath yellowish, the color of 

 the dorsal surface nearly meeting on the middle of the ventral surface; tail above marked 

 with broad transverse bars of black, alternating with narrower bars of brownish- 

 yellow; lower surfaco strongly reddish-yellow. Habitat, Plains of Colima, Western 



Mexico ANNULATUS. 



SPERMOPHILUS GRAMMURUS (Say) Bachman. 



Lined tailed Spcrmoptaile. 



Var. GRAMMUKUS. 



Koeky Mountain Lined-tailed Spcrmophile. 



Sciurus grammums Say, Long's Exped. to the Rocky Mts. ii, 1833, 72. — Harlan, Faun. Amer. 1825, 182. — 

 Godman, Amer. Nat. Hist, ii, 1826, 136.— H. Smith, Griffith's Cuvicr's Au. King, v, 1827, 255.— 

 Fischer, Synop. Mam. 1829, 350. 



SjKrmophilus grammurus Bachman, Charlesworth's Mug. Nat. Hist, iii, 1839, 390. — Wagner, Suppl. Schre- 

 ber's Siiuget. iii, 1843, 253 — Brandt, Hull. Classe Physico-matb. Acad. Imp. Sci. St. P<5tersb. 

 ii. 1-11, :;-n. Si his/. Syn. Mam. ii, 1 s 15, 74.— BaIRD, Proc. Acad. Nat. Sci. Phila. 1855, 334 ; 

 Mam. N. Amer. 1857, 310, pi. iv, animal ; U. S. and Mex. Bound. Surv. ii, pt. ii, 1859, 38 — 

 Coues, Amor. Nat. i. 1867, 360; Proc. Acad. Nat. Sci- Phila. 1867, 135.— Merriam, U.S. Geol. 

 Surv. T. it. 6th Ann. Bop. 1-73, 663.— Allen, Bull. Essex lust, vi, 1874, 66.— Coues & Yar- 

 row, Rep. Expl. aud Surv. West of 100th Merid. v, Zool. 1875, 121. 



