MUKIDAE-SIGMODONTES— HESrEROMTS LEUCOPUS. 51 



Mus sylvaticus, var., Erxleben, Syst. An. i, 17". r >, 390 (based on the New York var. of Pennant). 



Mus sylvaticus var. noreboracensis, Fischer, Synopsis, 1829, 318 (New York variety). 



Mus noveboracensis, Sei.ys-Longchamps, Etudes de Microm. 1839, G7. 



Mus agrarius var. americanus, "Kerr's Linnaeus, 1792, 231" (based on Pennant). 



Hesperomys ( Vesperimus) americanus, Coues & Yarrow, Rep. Zool. Expl. \V. 100th Merid. 1875, — (in press). 



Mus agrarius, Godman, Am. Nat. Hist, i, 3d ed. 1800, 310 (also in tbe earlier editions). — Linsley, Am. 

 Journ. Sci. xlii, 1842, 351. 



Museuhis leucopus, Rafinesque, Amer. Monthly Mag. iii, 1818, 440. 



Mus leucopus, Desmarest, Mainm. ii, 1822, 307.— Harlan, Fn. Amer. 1825, 151.— Griffith, Anim. Kiugd. 

 v, 1827, 233.— Fischer, Synopsis, 1829, 320.— ? Richardson, Zool. Journ. iii, 1818 ; Fn. Bor.- 

 Am. i, 1829, 142 (perhaps rather referable to var. sonoriensis). — DeKay, N. Y. Zool. i, 1842, 82, 

 pi. 23, tig. 1.— Aud. & Bach., Q. N. A. i, 1849, 300, pi. 40.— Thompson', Nat. Hist. Vermont, 

 1853, 13.— KennicOTT, Agric. Rep. U. S. Patent Office for 1850 (1857), 90, pi. 10. 



Hesperomys leucopus, LeCo.nte, Proc. Acad. Nat. Sci. Phila. vi, 1852, 413.— Baird, M. N. A. 1857, 459.— 

 Allen, Bull. Mus. Com p. Zool. i, 1809, 227 (Massachusetts), and ii, 1870, 178 (Florida).— 

 Dall, Alaska and its Resources, 1870, 577.— Maximilian, Arch. Naturg. xviii, 1802, pi. 4, f. 4 

 (penis-bone); Verz. N.-Am. Sang. 1802, 156. — Aud of most late writers. 



Hesperomys ( Vesperimus) leucopus, Coues, Proe. Acad. Nat. Sci. Phila. 1874, 178. 



Cricetus myoides, Gaiter, Zool. Journ. v, 1830, 204, pi. 10 (Cauada). 



Hesperomys myoides, Baird, M. N. A. 1857, 472 (Vermont; based on Gapper). 



ArricoU emmonsii, DeKay, Rep. Quad. Mass. 1840, 61. 



Hesperomys maniculatus, Wagner, Wiegmann's Archiv, 1843, ii, 141, and 1845, ii, 148; Abhand. Akad. 

 WissenBch. v, pt. ii, 1848, 310 (Labrador). 



Hesperomys polionotus, Wagner, Wiegmann's Archiv, 1843, ii, 52 (Georgia). 



Hesperomys campeslris, LeConte, Proc. Acad. Nat. Sci. Phila. vi, 1853, 413 (New Jersey ; type, No. 4720, 

 Mus. Smiths.).— Aud. & Bach., Q. N. A. iii, 1854, 295 (after LeConte).— Baird, M. N. A. 1857 

 485 (after LeConte). 



Hesperomys texanus, Woodiiouse, Proc. Acad. Nat. Sci. Phila. vi, 1853, 242; Sitgreave's Rep. Expl. 

 Zuui River, 1853, 48, pi. 2 ( El Paso, Tex. : type, No. 2559, Mus. Smiths.).— Aud. & Bach., Q. 

 N. A, iii, 1854, 319 (after Woodhouse).— Baird, M. N. A. 1857, 404, pi. 8, fig. 1, pi. 52, fig. 5, 

 a-b (Texas and New Mexico); U. S. & Mex. Bound. Surv. ii, pt. ii, 1859, 43. — Kennerly, 

 P. R. R. Rep. x, 1859, 14, pi. 8. fig. 1. 



Hesperomys eognatus, LeConte, Proc. Acad. Nat. Sci. Phila. vii, 1855, 442 (Southern States ; types, Nos. 

 4708, 4709, Mus. Smiths.).— Baird, 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, Mils. Smiths.). 



Hesperomys austerus, Baird, Proc. Aead. Nat. Sci. Phila. vii, 1855, 330 (Washington Territory; types in 

 Mus. Smiths.) ; M. N. A. 1857, 400.— Cooper & Suckley, Nat. Hist. Wash. Terr. 1800, 102, 127. 



Hesperomys boylii, Baird, Proe. Acad. Nat. Sci. Phila. vii, 1855, .".35 (El Dorado County, California; type, 

 No. 350, Mus. Smiths.) ; M. N. A. 1857, 471, pi. 8, f. 3, pi. 52, fig. 3, a-e (California, Oregon, 

 aud Washington Territory). 



Hesperomys gambeli, Baird, M. N. A. 1857, 404 (Pacific coast, United States). — Newberry, P. R. R. Rep. 

 vi, 1857, Zool. 00.— Baird, P. R. R. Rep. Cal. Route 1859, No. 3, 82.— Cooper & Suckley, 

 Nat. Hist. Wash. Terr. 1860, 102, 127. 



f Hesperomys intlianus, Maximilian, Archiv l'iir Naturg. xviii, pt. i, 1802, 111 ; Verz. N.-Am. Saug. 1802, 159 

 (Indiana). 



Note (1).— References to the recoguized 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 he required to be adopted 

 instead of the established leucopus which we continue to use. Since the animal falls iu a different genus 

 from Mus, sylvaticus or agrarius might perhaps he employed, though both of these terms were originally 

 proposed for another species. Another candidate for recognition is tbe varietal term americanus, said to 

 appear in Kerr's Linnaeus, 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 final 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 



