156 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
as many dividing lines as can be drawn between individual species and little 
groups of conspecies. On this consideration, we have no scruple in drawing 
up the characters of Myonomes so stringently that all the European and Asiatic 
forms shall be excluded if possible. 
Though we adopt tie term ‘“‘Myonomes” for what Professor Baird called 
Hemiotomys, we do not suppose that Rafinesque had any idea what he was 
about when he invented it. But there stands the name ‘“ Mynomes praten- 
sis”, based upon Wilson’s Meadow Mouse, afterward Arvicola pennsylvanica 
of Ord, which is also Arvicola riparius of Ord. We do not see how the 
name can be rejected, seeing that his type—a now well-known species—is 
mentioned ; and, after all, it is perhaps just as well that he did not try to 
explain what he meant. 
ARVICOLA (MYONOMES) RIPARIUS, Ord. 
Common American Meadow Mouse. 
Campagnol or Mcadow Mouse of Pennsylvania, WARDEN, “ Descr. U.S. v, 625.” 
Meadow Mouse, Witson, Am. Orn. vi, pl. 50, f. 3. 
Mynomes pratensis, RAFUINESQUE, Am. Monthly Mag. ii, 1817, 45. 
Arvicola pennsylvanica,* Orv, Guthrie’s Geog. 2d Am. ed. ii, 1515, 292 (based on Wilson, J. c.).—HARLAN, 
Fu. Amer. 1825, 144 (in part. Quotes Ord, /. ¢., and describes pinetorum).—WAGNER, Suppl. 
Schreb. viii, 588.—ScH1Nnz, Synopsis, ii, 1845, 247.—Aup. & Bacu., Q. N. A. i, 1849, 341, pl. 
xlv. f. —.—LxConrrE, Proe. Acad. Nat. Sci. Phila. vi, 1853, 407. 
Arvicola palustris, HARLAN, Fn. Amer. 1825, 136; Med. & Phys. Researches, 1835, 47. 
Arvicola riparius, ORD, Journ. Acad. Nat. Sci. Phila. iv, pt. ii, 1825, 305 (Philadelphia), (not of Richard- 
; son ?).—DrEKay, N. Y. Zool. i, 1242, #4, pl. xxii, f. 2 (ycung?).—Aup. & Bacu., Q. N. A. iii, 
1854, 302 (not figured. In text under “montana”)—LECONTE, Proc. Acad. Nat. Sci. Phila. 
vi, 1853, 406.—Barrp, M. N. A. 1857, 522 (Eastern United States).—Gopman, Amer. Nat. Hist. 
3d ed. 1860, i, 301—ALLEN, Mumm. Mass., Bull. Mus. Comp. Zool. No. 8, 231.—And of late 
authors generally. 
Arvicola (Myonomes) riparius, Cours, Proc. Acad. Nat. Sci. Phila. 1874, 189.—Covurs & Yarrow, Zool. 
Expl. W. 100th Merid. 1876, —. 
Arvicola riparius longipilis, KENNICOTT, Agric. Rep. U.S. Patent Office for 1&56-185§, 304 (specimens in 
heavy winter pelage from West Northfield, Il].).—Bainrp, M. N. A. 1857,-524 (in text; same 
as Kennicott’s). 
Aypudeus riparius, MAXIMILIAN, Arch. Naturg. xviii, 1862; Verz. N.-A. Siiug. 1862, 174. 
Arvicola xanthognatha, HARLAN, Fn. Amer, 1825, 136—Gopman, Amer. Nat. Hist. ii, 1826, 65; and 3d ed. 
1860, i, 299 (not of Leach and Richardson).—Say, Long’s Exped. R. Mts. i, 1828, 369.—DrEKay, 
N. Y. Zool. i, 1842, 90.—Linstey, Am. Journ. Sei. xliii, 1842, 350.—?? Sapine, App. Frank- 
lin’s Journ. 1825, 660.+ 
*This should stand, in strictness, as the specific name, with which Ord antedates Rafinesque. 
Since, however, the name is simply based, without sufficient description, upon a scarcely recognizable 
figure incidentally introduced in an ornithological work, I have preferred to adopt the same author’s 
properly-characterized term riparius, though subsequent in point of date. Though I am aware that this 
course is, technically, indefensible, such slight latitude of choice stands to common sense, and infringes 
upon no author’s rights, as Ord’s earlier term cuts Rafinesque out of his. 
t Doubtful. I have not been able to look up this reference; but Richardson says (F. B.-A. i, 122), 
“The description quoted by Sabine * * under title of 4. xanthognatha does not belong to this animal, 
but to a much smaller species, which I have referred to the 4. pennsylvanica of Ord.” 
