NATURAL SCIENCES OF PHILADELPHIA. 1T9 



Mus agrarius, Godmau, Am. Nat. Hist. i. 3tl ed. 1800, 316 (also in the 



earlier editions). 

 Cricekis myoides, Gapper, Zool. Journ. v. 1830, 204, pi. 10 (Canada). 

 IIef(i)eromys ^nyoides, Baird, M. N. A. 1857, 472 (Vermont, based on 



Gapper'). 

 Arvicola emmonsii, DeKay, Eep. Quad. Mass. 1840, 61. 

 [ Musculus leucopus, Raf., Amer. Month. Mag. iii. 1818, 446. 

 Mus leucopus, Desm., Mamm. ii. 1822, 307 ; and of authors. 

 Hesperomys leucopus^ Le C, P. A. N. S. P. vi. 1852, 418, and of authors. 

 Hesperomys maniculatus, Wagn., Wieg. Arch. ii. 1843, 141, and ii. 



1845, 148; Abh. Aliad. Wissen., v. 1848, 316 (Labrador). 

 Hesperomys p>olionotux, Wagn., Wieg. Arcli. ii. 1843, 52 (Georgia). 

 Hesperomys campestris, Le C, P. A, N. S. P. vi. 1853, 413 (New 



Jersey). 

 Hcspermys texanus, Woodli., P. A. N. S. P. \\. 1853, 243 (Texas). 

 Hesperomys cognatus, Le C, P. A. N. S. P. vii. 1855, 442 (Soutliern 

 States). 



Hesperomys gracilis, Le C, P. A. N. S. P. vii. 1855, 442 (Northwest 



States). 

 Hesperomys austerus, Bd., P. A. N. S. P. vii. 1855, 336 (Washington 



Territory). 

 Hesperomys boylii, Bd., P. A. N. S. P. vii. 1855, 335 (California). 

 Hesperomys gamheli, Bd., M. N. A. 1857, 464 (Pacific Coast, U. S.), 

 fHesperomys indiumis, Maxim., Arch. f. Naturg. xviii. 1862, 111 {fide 



Allen). 



\_Note.~1\\Q above synonymy is exclusive of the several geographical 

 varieties of ttiis species which may be recognized.] 



Hah. North America generall3\ 



la. Hesperomys (Vesperimus) leucopus gossypinus (Le C). 



Syn. Hesperomys gossypitius, Le Conte, P. A. N. S. P. vi. 1853, 411 

 (Georgia). 

 Hypudceus gossypinus, Le C, McMurtrie's Cuvier, i. 434, App. 



Hah. South Atlantic States. 



lb. Hesperomys (Vesperimus) leucopus sonoriensis (Le C). 



Syn. ? Mus leucopus. Rich., Zool. Journ. iii. 1818, and F. B. A. i. 1829, 

 142. 

 Hesperomys sonoriensis, Le C, P. A. N. S. P. vi. 1853, 413 (Sonora). 

 Hesperomys sonoriensis, var. nehrascensis, Bd. M. N. A. 462, in text. 



Hah. Interior of North America, west of the Mississippi, from 

 Arctic Regions to Mexico (usuallj^ occupying this range to the 



' The presence of cheek pouches, supposed to remarkably distinguish 

 this animal, I have determined in all the species of Vesperimus examined. 

 It is an interesting question whether they also occur in South American 

 forms. 



