RODENTIAMURID.E HESPEROMYS AMERICANOS. 



103 



Arvicola cmmonsii, DEKAY, Rep. Quad. Mass., 1840, Gl. 

 Musculus leucopus, RAF., AID. Month. Mag., iii, 1818, 446. 

 Mus leucopus, DESM., Mainin., ii, 1822, 307; arid of authors. 

 Hesperomys leucopus, LEC., P. A. N. S. P., vi, 1852, 413 ; and of authors. 

 Ilcsperomys (Vesperimus) leucopus, COUES, Proc. Acad. Nat. Sei. Phila., 1S74, 178. 

 Hesperomys manicnlatus, WAGN., Wieg. Arch., ii, 1843, 141, aud li, 1845, 148 ; Abh. 



Akad. Wissen., v, 1848, 316 (Labrador). 



Hesperomys polionotus, WAGN., Wieg. Arch., ii, 1843, 52 (Georgia). 

 Ilixperomys campestris, LEG., P. A. N. S. P., vi, 1853, 413 (New Jersey). 

 Hesperomys texanus, WOODH., P. A. N. S. P., vi, 1853, 242 (Texas). 

 Jlcxpcromys cognatus, LEG., P. A. N. S. P., vii, 1855, 442 (Southern States). 

 Ilcxperomys gracilh, LEG., P. A. N. S. P., vii, 1855, 442 (Northwestern 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 gambeli, BD., M. N. A., 1857, 464 (Pacific coast, United States). 

 I Hesperomys indianus, MAXIM., Arch. f. Naturg., xviii, 1862, 111 (fide Allen). 



NOTE. The above synonymy is exclusive of the several geographical varieties of 

 this species which may be recognized. 



IlAB. North America generally. 



Var. SONORIENSIS. 



i.Mus leucopus, RICH., Zool. Journ., iii, 1818, and F. B.-A., i, 1829, 142. 

 Hesperomys sonoricnsis, LEG., P. A. N. S. P., vi, 1853, 413 (Sonora). 

 Hesperomys sonoriensis var. nebrascensis, BD., M. N. A., 462, in text. 

 Hesperomys ( Vesperimm) leucopus sonoriensis, COUES, Proc. Acad. Nat. Sci. Phila., 

 1874, 179. 



HAB. Interior of North America, west of the Mississippi, from Arctic regions to 

 Mexico (usually occupying this range to the exclusion of typical americanus, but some- 

 times associated with it). This is the ordinary species of these regions, as shown by 

 the following series of specimens : 



Specimens. 



