218 MURIDJ5. SPERMOPHXLTTS. 



XERUS. 



Teeth :— Incisors ~; Molars — or — ;=20 or 22. 



1-1 4-4 4-4 ' 



The Agiump. Xerus setosus. 



*a. Skull. W. Africa. 



b. Skull. 



c. Skull. W. Africa. From the Zoological Society's Collection. 



Xerus erythropus. 

 a. Skull. From the Zoological Society's Collection. 



TAMIAS. 

 Teeth :— Incisors £ ; Molars £} ;=20. 



1-1 4-4 ' 



The Hackee. Tamia3 lysteri. 



a, b. Skulls. N. America. 



1 W 11 ' I ^ rom the Zoological Society's Collection. 



The Swiss. Tamias striatus. 



Gray, Cat. Mamm. Brit. Mus. p. 145, 1843. — Baird, Mamm. N. 



America, p. 292. pi. 46. fig. 2 (skull), 1859. 

 Sciurus striatus, F. Cuv., M6ru. du Mus. x. p. 120. pi. 10. fig. 1 a, b 



(skull). 



*«. Skull. Altai Mountains. From Mr. Brandt's Collection. 



b. Skull. Russia. 



Townsend's Striped Squirrel. Tamias townsendii. 



Bach, Journ. Acad. Nat. Sci. Philad. viii. 1, 1839, p. 68. — Baird, 

 Mamm. N. America, p. 300. pi. 45. fig. 4 (skull), 1859. 



SPERMOPHILUS. 



Teeth :— Incisors |=i; Molars ~; =22. 



The Red-cheeked Souslik. Spermophilus erythrogenys. 

 *a. Skull. Siberia. 



Spermophilus mugosaricus. 



*«. Skull. Altai Mountains. 

 b. Skull. Russia. 



Say's Marmot. Spermophilus lateralis. 

 Baird, Mamm. N. America, p. 312. pi. 45. fig. 5 (skull), 1859. 



