EODENTIA— MUBIDM— AEVICOLA. 105 



OCHETODON HUMILIS, (Ami. & Bacli.) Coues. 



Mtis humilis. Aud. & Each., P. A. N. S. P., i, 1841, 97 ; J. A. N. S. P., viii, 1842, 300; 



Q. N. A., ii, 1851, 103, pi. lxv (South Atlantic States). 

 Hesperomys humilis, Wagnek, Wieg. Arch., 1843, 51. 

 Reithrodon humilis, Bd., M. N. A., 1857, 44S. 

 Ochetodon humilis, Coues, Proc. Acad. Nat. Sci. Phila., 1874, 185. 

 Mus lecontii, Aud. & Bach., J. A. N. S. P., viii, 1842, 307 ; Q. N. A., iii, 1854, 324 (no 



rig.), (South Carolina). 

 Eespcromys lecontii, Wagn., Wieg. Arch., 1843, 51. 

 Reithrodon lecontii, LeC, P. A. N. S. P., vi, 1853, 413. 

 1 Mus carolinensis, Aud. & Bach., J. A. N. S. P., viii, 1842, 306; Q. N. A., iii, 1854, 



332 (South Carolina). 

 ? Hesperomys carolinensis, Wagn., Wieg. Arch., ii, 1853, 51. 

 ? Reithrodon carolinensis, Bd., M. N. A., 1S57, 452. 

 Reithrodon megalotis, Bd., M. X. A., 1857, 451 ; Rep. Mex. B. Surv., ii, pt. ii, 1859, 43, 



pi. vii, fig. 4 «-(•. pi. xxiv, tig. 4 a-g (Sonora). 

 Had. — United States, southerly. South Carolina to Texas. Kansas, Missouri, 

 Iowa, Nebraska, Utah, Sonora. 



Although not observed by the expedition, the known range of this 

 species, as may be gathered from the foregoing, includes New Mexico and 

 Arizona. The following species may also occur in the regions explored : 



OCHETODON LONGICAUDA, (Baud) Coues. 



Reithrodon longicauda, Baled, M. N. A., 1S57, 451.— ? Tomes, P. Z. S., 1801, 2S4 



(Guatemala). 

 Ochetodon longicauda, Coues, Proc. Acad. Nat. Sci. Phila., 1874, 1S6. 

 Hab. — California (? south thence to Guatemala). 



Subfamily ARVICOLINAE. 

 Genus ARVICOLA, Lace"p., emend. 



Mus (sp.), Linn., Syst. Nat., i, 1700, et auct. antiq. 



Mures cunicularii, Pall., N. Sp. Glir., 1778, 77. 



Lemmus, Linck, Fischer, et al. 



Myodes, Pall., Zoog. E. A., i, 1811, 172 (not Myodcs of Selys-L., 1839, which = 



Hypudceus, Keys. & Blas. = Evotomys, Coues). 

 Arvicola, LACEPEDE, Tab!., 1803, et auct. recent, (includes amphibius and arvalis). 

 Hypudecus, III., Prod., 1811 (not of Keys. & Blas., nor of Baied ; includes lemmus, 



amphibius, and arvalis). 

 jUj/t>ttomes,EAFiNESQUE, (type" Wilson's Meadow Mouse" = Arvicola pennsylvanica Ord). 

 Psammomys, LeC, Ann. Lye. N. Y., 1S29, 132 (type pinetorum ; not of EUEPPEL). 

 1'itymys, McMueteie's ed. Cuvier, i, 1831, 434 (type A. pinetorum). 

 Hemiotomys, Selys-L., Etudes, 1839, 85 (amphibius, terrestris, etc.). 

 Microtus, Selys L., Etudes, 1839, 80. 



