21 



Myonomes). Ear with a rim in front of meatus, the anterior and 

 posterior roots of the auricle there meeting. Soles 5-tuberculate (?). 

 Fore claws not larger than the hinder. Tail about ^ the head and 

 body. Pelage ordinary. Size minimum. 



C. Pedomys. Back and middle upper molars as in the last. Front lower 



molar with only 3 internal and 1 external triangle. Ear unrimmed. 

 Soles 5-tuberculate. Fore claws not larger than the hinder. Tail ^ 

 the head and body, or rather less. Pelage ordinary. Size medium. 



D. PiTYMYS. Molars all as in Pedomys. Ears unrimmed. Soles o-tuber- 



culate. Fore claws larger than the hinder. Tail about \ the head 

 and body, or less. Pelage dense, silky, mole-like. Size small. 



Subgenus Myonomes, Raf. 



Syn. Arvicola of most American writers. — Arvicola, A, Hemiotomys,, 

 Baird, M. N. A. 1857, 515 (type riparius. Not of Selys-L.). 

 — Myonomes, Raf. (type 31. pratensis, Raf, based on "Wil- 

 son's Meadow Mouse" = A. pennsylvanicu., Ord. = A. riparius, 

 Ord.). 



1. Arvicola (Myonomes) riparius, Ord. 



Syn. Gampagnol or Meadoio Mouse of Pennsylvunia, Warden, Descr. 



U. S., V. 625. 

 Meadow Mouse, Wils., Am. Orn., vi. pi. 50, f 3. 



Arvicola pennsylvanica, Ord, Guthrie's Geog. 2d Am. ed. ii. 1815, 292 

 (based on the foregoing). — Harlan, Fn. Amer. 1825, 144 (in part; 

 quotes Ord, but ^escvihespinetorum). 

 Arvicola riparius, Ord, J. A. N. S. P. iv. 1825, 305. (Philadelphia.) 

 Arvicola riparius longipilis, Kenn., Agric. Rep. U. S. Patent Office, 



1856, 304. (West Northfield, 111. ; in winter pelage.) 

 Arvicola xanthognatlia, Harlan, Fn. Amer. 1825, 136 (also of God- 

 man, Say, DeKay, and Linsley, but not of Leach nor of Richardson). 

 Arvicola nlborufescens, Emmons, Rep. Quad. Mass. 1840, 60 (albino). 

 Arvicola Mrsutus, Emmons, I. c. 



Arvicola nasuta, Bachm., J. A. N. S. Phila. viii. 1842, 296. (Massa- 

 chusetts.) 

 Arvicola oneida, DeKay, N, Y. Fn. i. 1842, 88, pi. xxiv. f 1. (New 



York. ) 

 Arvicola rufescens, DeKay, op. cit. 85, pi. xxii. f 1. (New York.) 

 Arvicola occidentalis, Peale, Mamm. U. S. Ex. Ex. 1848, 45. (Puget 



Sound. ) 

 Arvicola calif ornica, Peale, op. cit. 46. (California.) 

 Arvicola montana, Peale, op. cit. 44. (California.) 

 Arvicola edax, Le C, P. A. N. S. P. vi. 1853, 405. (California.) 

 Arvicola borealis, Le C, op. cit. 407. (Rhode Island.) (Not of Rich.) 

 Arvicola Irowbridgei, Bd., M. N. A. 1857, 529 (in text). (California.) 

 Arvicola longirostris, Bd., op. cit. 530. (California.) 



2* 



