MAMMALS OF MINNESOTA. 237 



Lepns artemisia BACHMAN, Journ. Acad. N. S. Phila., viii, 1839, 94; 



Townsend's Narrative, 1839, 329. 

 WATERHOUSE, N. H. Mam., ii, 1848, 126. 

 ATJD. and BACH., Quad. N. A., 1851, ii, 272. 

 WOODHOUSE, Sitgreave's Col. and Zuni R. Exp., 1853. 

 BAIRD, Mam. N. A., 1857, 602; U. S. and Mex. Bound. 



Surv., ii, 1859, ii, 48. 



NEWBERRY, Pacif. R.R. Rep., vi, iv, 1857, 65. 

 KENNERLY, ibid., x, vi, 1859, 16. 

 SUCKLEY, ibid., xii, iii, 1860, 105. 

 STJCKLEY and GIBBS, ibid, 132. 



HAYDEN, Trans. Am. Phil. Soc. Phila., xii, 1863, 148. 

 COUES, Am. Nat., i, 1867, 534; Proc. Acad. Nat. Sci. Phila., 



1867, 136. 



Sylvilagus artemisia GRAY, Ann. and Mag. N. H. 3d series, xx, 1867, 222. 

 Lepus artemisiacus WAGNER, Suppl. Schreber's Saug., iv, 1844. 



VAR. AUDUBONI. 



Lepus auduboni BAIRD, Mam. N. A., 1857, 608. 



NEWBERRY, Pac. R. R. Rep., vi, iv, 1857, 65. 



KENNERLY, ibid, x, vi, 1859, 17. 



GRAY, Ann. and Mag. N. H. 3d series, xx, 1867. 



Lepus sylvaticus var. aububoni ALLEN, Proc. Bost. Soc. N. H., xvii, 1875 t 

 434; Monog. N. A. Rod., ii, p. 329. 



Geographical variation and distribution. As regards the gen- 

 eral subject, the present writer can hope to add nothing to the 

 exhaustive elaboration in Allen's memoir, from which the facts 

 respecting the geographical variation outside our own state 

 are taken with no further acknowledgement. The habitat of 

 L. (Sylvilagus) sylvaticus extends from a line north of tne 

 isotherm of 45, but conforming more or less with it, except 

 westerly, where the northern limit is restricted, over the 

 greater part of the United States and southward to Yucatan. 



The typical L . sylvaticus extends from Southern Maine west 

 to Dakota, south through Nebraska, Kansas, Indian Territory 

 and Eastern Texas to Yucatan. The entire United States east 

 of this line save the hights of the Alleghanies are occupied by 

 this tolerably permament variety. The geographical variation 

 over this region consists in "an increasing paleness from the 

 Mississippi westward toward the plains, where the variety 

 sylvaticus passes by insensible steps into variety nuttaUi. The 

 specimens from 'Eastern Nebraska and Eastern Dakota can, in 

 general, hardly be referable to the one form rather than 

 the other. At the southward the colors become slightly more 

 intense, but the difference is by no means striking. * * * The 

 brownish terminal band of the under fur becomes more uni- 



