MURIDAE— SIGMODONTES—HESPEROMYS LEUCOPUS. 51 
Mus sylvaticus, var., ERXLEBEN, Syst. An. i, 1775, 390 (based on the New York var. of Pennant). 
Mus sylvaticus var. noveboracensis, Fiscurk, Synopsis, 1829, 318 (New York variety). 
Mus noveboracensis, SELYS-LONGCHAMPS, Etudes de Microm. 1839, 67. 
Mus agrarius var. americanus, “ Kerr’s Linneus, 1792, 231” (based on Pennant). 
Hesperomys ( Vesperinus) americanus, CouES & Yarrow, Rep. Zool. Expl. W. 100th Merid. 1875, — (in press). 
Mus agrarius, GODMAN, Am. Nat. Hist. i, 3d ed. 1860, 316 (also in the earlier editions)—Lins.ry, Am. 
Journ. Sci. xlii, 1842, 351. 
Musculus leucopus, RAFINESQUE, Amer. Monthly Mag. iii, 1813, 446. 
Mus leucopus, DesMAREST, Mamm. ii, 1822, 307.—Hanrvan, Fn. Amer. 1825, 151.—Grirrirn, Anim. Kingd. 
VY, 1827, 233.—FiscuEr, Synopsis, 1829, 326.—? Ricuarpson, Zool. Journ. iii, 1818; In. Bor. 
Am, i, 1229, 142 (perhaps rather referable to var. sonoriensis)—DrKay, N. Y. Zool. i, 1842, 82, 
pl. 23, fig. 1—Avup. & Bacn., Q.N. A. i, 1849, 300, pl. 46.—Tuompson, Nat. Hist. Vermont, 
1853, 13.—KEnnicort, Agric. Rep. U. S. Patent Office for 1856 (1857), 90, pl. 10. 
Hesperomys leucopus, LECONTE, Proce. Acad, Nat. Sci. Phila. vi, 1852, 413.—Barrp, M. N. A. 1857, 459.— 
ALLEN, Bull. Mus. Comp. Zool. i, 1869, 227 (Massachusetts), and ii, 1870, 178 (Florida).— 
Dat, Alaska and its Resources, 1870, 577.—MaxiM1114n, Arch. Naturg. xviii, 1862, pl. 4, f. 4 
(penis-bone); Verz. N.-Am. Siiug. 1862, 156.—And of most late writers. 
Hesperomys ( Vesperimus) leucopus, COUES, Proc. Acad. Nat. Sei. Phila. 1874, 178. 
Cricetus myoides, GAPPER, Zool. Journ. v, 1830, 204, pl. 10 (Canada). 
Hesperomys myoides, Barrp, M. N. A. 1857, 472 (Vermont; based on Gapper). 
Arvicola emmonsii, DEKAY, Rep. Quad. Mass. 1840, 61. 
Hespcromys maniculatus, WAGNER, Wiegmann’s Archiy, 1843, ii, 141, and 1845, ii, 148; Abhand. Akad. 
Wissensch. v, pt. ii, 1848, 316 (Labrador). 
Hesperomys polionotus, WAGNER, Wiegmann’s Archiv, 1843, ii, 52 (Georgia). 
Hesperomys campestris, LECONTE, Proc, Acad. Nat. Sci. Phila. vi, 1853, 413 (New Jersey ; type, No. 4726, 
Mus. Smiths.).—Aup. & Bacu., Q. N. A. iii, 1854, 295 (after LeConte).—Bairp, M. N. A. 1857, 
485 (after LeConte). 
Hesperomys texanus, Woopnouse, Proc. Acad. Nat. Sci. Phila. vi, 1853, 242; Sitgreave’s Rep. Expl. 
Zuni River, 1853, 48, pl. 2 (El Paso, Tex.; type, No. 2559, Mus. Smiths.).—Aup. & Bacn., Q. 
N. A, iii, 1854, 319 (atter Woodhouse).—Bairp, M. N. A. 1857, 464, pl. 8, fig. 1, pl. 52, fig. 5, 
a-b (Texas and New Mexico); U.S. & Mex. Bound. Surv. ii, pt. ii, 1859, 43.—KrNNeErzy, 
P. R. R. Rep. x, 1859, 14, pl. 8. fig. 1. 
Hesperomys cognatus, LeContTE, Proc. Acad. Nat. Sci. Phila. vii, 1855, 442 (Southern States; types, Nos. 
4703, 4709, Mus. Smiths.).—Barnp, M. N. A. 1857, 469 (Southern States). 
Hesperomys gracilis, LECONTE, Proc. Acad. Nat. Sci. Phila. vii, 1855, 442 (Ohio or Michigan, and Wiscon- 
sin; types, Nos. ——, 4710, Mus. Smiths.). 
Hesperomys austerus, BAtRD, Proc. Acad. Nat. Sci. Phila. vii, 1855, 3364 Washington Territory ; types in 
Mus. Smiths.) ; M. N. A. 1857, 466.—Cooprr & SuckLey, Nat. Hist. Wash. Terr. 1860, 102, 127. 
Hesperomys boylii, Bstrp, Proc. Acad. Nat. Sci. Phila. vii, 1855, 535 (El Dorado County, California; type, 
No. 356, Mus. Smiths.); M. N. A. 1857, 471, pl. 8, f. 3, pl. 52, fig. 3, a-e (California, Oregon, 
and Washington Territory). 
Hesperomys gambeli, BarrpD, M. N. A. 1857, 464 (Pacific coast, United States)—Nerwserry, P. R. R. Rep. 
vi, 1857, Zool. 60.—Bairp, P. R. R. Rep. Cal. Route 1859, No. 3, 82.—Coorrr & SuCKLEY, 
Nat. Hist. Wash. Terr. 1860, 102, 127. 
ol og? Hesperomys indianus, MAXIMILIAN, Archiy fiir Naturg. xviii, pt. i, 1862,111; Verz. N.-Am. Siiug. 1862, 159 
(Indiana). 
Nore (1).—References to the recognized varieties of leucopus are excluded from the above, and will 
be found under their respective heads. : 
Note (2).—It is not certain that some other specific name will not be required to be adopted 
instead of the established Jeucopus which we continue to use. Since the animal falls in a different genus 
from Mus, sylvaticus or agrarius might perhaps be employed, though both of these terms were originally 
proposed for another species. Another candidate for recognition is the varietal term americanus, said to 
appear in Kerr’s Linneus, 1792. The latter will be found used by Dr. Yarrow and ourselves in the 
forthcoming volume above cited ; as we fully expected, at the time of allowing it to pass into metal, to 
be able to verify the quotation. Reference to Kerr’s work, however, having proved impracticable, the 
term leucopus is allowed to stand, pending fical settlement of the question. 
The characters of Hesperomys leucopus will have been so fully elucidated 
by the time we have concluded the investigation that we purpose entering 
