SCIURID.E. CLXXXVII. 323 



550. ARCTOMYS Sclireber. MARMOTS. (apKros, bear ; /is, 

 mouse.) 



1053. A. moiiax (L.). WOODCHUCK. GROUND HOG. Grizzly 

 gray, varying to chestnut and blackish. L. 1 8. T. 5. Hudson's 

 Bay to Va., W. to Neb. ; common. (Lat., solitary.) 



551. CYNOMYS Rafinesque. (KVQ>V, dog ; pvs, mouse.) 



1054. C. ludovicianus (Ord). MISSOURI PRAIRIE DOG. Red- 

 dish brown, varied with darker and gray; tawny below. L. 16^. 

 T. 3^. Kas. to Montana, E. of Rocky Mts., living in large colonies. 

 (Lat., of Louisiana.) 



552. SFERMOPHILUS Cuvier. (cnrtpfta, seed ; $1X0?, loving.) 



a. Skull very long and narrow, the snout broad and very long; tail long; ear 

 small. (Ictidomys Allen). 



1055. S. franklin! (Sabine). GRAY GOPHER. Yellowish brown, 

 mottled with black. L. 15. T. 5. Prairies ; N. 111. and N. W. 

 (To Sir John Franklin.) 



1056. S tridecemlineatus (Mitchill). STRIPED GOPHER. Dark 

 brown, mixed with reddish, with 6 to 8 light stripes alternating with 

 lines of dots, about 13 streaks in all ; yellowish below, with a broad 

 black stripe on each side. L. 10^. T. 3^. Prairies ; Ark. to 111. 

 and N. W., common. (Lat., 13-lined.) 



553. TAMIAS Illiger. (ret/was, a steward.) 

 a. Premolars \. 



1057. T. striatus (L.). CHIPMUNK. GROUND SQUIRREL. Red- 

 dish brown ; back with 5 black stripes and 2 whitish ones ; rump 

 reddish. L. 11. T. 4^. Maine to Va. and W., abundant; the 

 Southern form is var. lysteri (Pallas). 



aa. Premolars *. 



1058. T. asiaticus (Gmelin). MISSOURI CHIPMUNK. Back with 

 5 black stripes and 4 whitish ones ; rump grayish. L. 8. T. 4. 

 Wis. (Hoy.), N. W. to Asia. The E. form, var. quadrivittatus Say, 

 has the sides bright rusty, the stripes on back well-defined. (Eu.) 



554. SCIURUS Linnaeus, (enaoupo?, squirrel ; o-Kid, shade ; 

 ovpa, tail.) 



1059. S. hudsonicus Erxleben. RED SQUIRREL. CHICKAREE. 

 Yellowish gray, back with a median wash of bright rusty red ; tail 

 short and narrow, with a subterminal band of black. L. 14. T. 6^. 

 N. Am., S. to Penn. and N. Ind. ; abundant N. 



1060. S. carolinensis Gmelin. GRAY SQUIRREL. BLACK 

 SQUIRREL. Whitish gray, usually varied with tawny ; middle of 

 back brownish ; ears not tufted ; often entirely jet black. L. 20. 

 T. 9. N. Am., E. of the plains, abundant. The common Northern 



