NATURAL SCIENCES OF PHILADELPHIA. 189 



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

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

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

 body. Pelage ordinary. Size minimum. 



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

 molar with only 2 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. 



I). PiTYMYS. Molars all as in Pedomys. Ears unrimmed. Soles 5-tuber- 

 culate. Fore claws larger than the hinder. Tail al)out \ the head 

 and bod}^, or less. Pelage dense, silky, mole-like. Size small. 



Subgenus Myonomes, Raf. 



Syn. Arvieola of most American writers. Arvicohi., A, IIemiotomy^ 

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

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

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

 Ord.). 



I. Arvicola (Myoaomes) riparius, Ord. 



Syn. Cavipagnol or Meadow Mouse of Pennsylvania., Warden, Descr. 



U. S., V. 625. 

 Meadoto 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 (S.e?,Q,v\\ies pinetorum) . 

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

 Arvicola ripariris longipilis, Kenn., Agric. Rep. U. S. Patent OlEce, 



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

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

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

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

 Arvicola hirsutus, 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. (Xew 



York.) 

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

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



Sound. ) 

 Arvicola ealifornica, Peale, op. cit. 46. (California.) 

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

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

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

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

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



