si; 4 



MOMN.K.M'IIS OF NORTH AMERICAN KOMONTIA. 



Table CVIL— Measurements of tiro skulls of Spermophilus tereticaddus. 



Table CVIII. — List of spt&mens examined of Spermophilus tereticaudus. 



SPERMOPUILUS SP1LOSOMA Bennett. 



Sonoran Spermophile. 



Spermoph las spil tsoma Bennett, Proc. Zoiil. Soc. i, 1833, 40 (" California '').— Richardson, Zool. Beeclioy's 

 Voy. 1839, Main. 1'-'*.— Wagner, Suppl. Schreber's Sauget. iii, 1843, 251 (foot-note). — AUDU- 

 BON i BaCHHAN, Quad. N. Am. pi. cix, folio ed. — Baiiid, Proc. Acad. Nat. Sci. Puila. 1855, 

 332 ; Mam. N. Am. 1857, 321 ; U. S. and Mex. Bound. Surv. ii, pt. ii, 1859, 39, pi. vii, fig. 3 

 (head and feet). 



Spermophilus mexicanut Audubon & Bachman, Quad. N. Am. iii, 1853, 39 (in part). 



Spermophilus spihsoma var. spilosoma Allen, Proc. Boat. Soc. Nat. Hist, xvi, 1874, 291. 



Specific chars. — Length of head and body G 50 to 7.00; of tail to end 

 of vertebrae 250 to 3 00; to end of hairs 3.25 to 3 75. Above, reddish- 

 brown, with indistinct subquadrate spots of white, bordered posteriorly with 

 black. The spots are most distinct on the hinder part of the back, and are 

 more distinct in the young than in the adult Beneath, white, varying to 

 strongly yellowish-white. Tail above colored like the back; with a single 

 broad siibterminal black bar, extending for only a short distance along the 

 sides; beneath, centrally, brownish-yellow, with a black border edged with 

 yellowish. The tail (vertebrae alone) is less than half the length of the body, 

 round, generally bushy onlv at (lie tip, and not distinctly distichous. The 



