218 MURID #.—SPERMOPHILUS. 
XERUS. 
Teeth :—Incisors = ; Molars = or $5 ;=20 or 22. 
The Actump. Xerus setosus. 
*a. Skull. W. Africa. 
6. 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. 
The Hacxes. Tamias lysteri. 
a, 6, Skulls. N. America. 
a. cepa \ From the Zoological Society’s Collection. 
The Swiss. Tamias striatus. 
Gray, Cat. Mamm. Brit. Mus. p. 145, 1843.—Baird, Mamm, N. 
America, p, 292. pl. 46. fig. 2 (skull), 1859. 
Sciurus striatus, F. Cuv., Mém. du Mus. x. p. 120. pl. 10. fig. 1 a, 6 
(skull). 
*q, Skull. Altai Mountains. From Mr. Brandt’s Collection. 
6. Skull. Russia. ; 
TowNnsEND’s STRIPED SeurIRREL. Tamias townsendii. 
Bach, Journ. Acad. Nat. Sci. Philad. viii. 1, 1889, p. 68.—Baird, 
Mamm. N. America, p. 300. pl. 45. fig. 4 (skull), 1859. 
SPERMOPHILUS. 
Teeth :—Incisors 1! Molars = * 52222. 
i] : 3 
The Rep-cyeexEp Sovstrx. Spermophilus erythrogenys. 
¥qa, Skull. Siberia. 
Spermophilus mugosaricus. 
*q, Skull. Altai Mountains. 
6. Skull. Russia. 
Say’s Marmor. Spermophilus lateralis. 
Baird, Mamm. N. America, p. 312. pl. 46. fig. 5 (skull), 1859. 
