CASTOR. EPINOMYS. 41 



Type locality. Ruidoso Creek, six miles below Ruidoso, New 

 Mexico. 



Genl. Char. Medium size, pale in hue and but little of the chest- 

 nut color. Skull, short, wide; rostrum and nasals wide. 



Color. Above dull russet, crown brighter; cheeks and rump paler; 

 underparts drab, sometimes buffy gray; hands and feet dark drab, 

 with some chestnut color on feet; flanks dark drab. Ex type in 

 United States National Museum. 



Measurements. Total length, 1072; tail, 400; hind foot, 172. 

 Skull: Occipito-nasal length, 145.6; zygomatic width, 101; Hensel, 

 122.6; length of nasals (medium), 48.7; palatal length, 32.9; length 

 of upper molar series, 30; length of mandible, 110.5; length of lower 

 molar series, 35.3. Ex type in United States National Museum. 



Castor caecator Bangs. 



Castor creator Bangs, Bull. Mus. Comp. Zool., 54, 1913, p. 513. 

 Type locality. Bay St. George, Newfoundland. 



Family Muridae. Rats, Mice, Voles. 



Subfamily Murinae. 



Genus Epinomys. 



Rattus Fitzinger, Sitzungsb. Math.-Naturw. Clas. Kong. Akad. 



Wiss. Wien, LVI, 1867, Pt. II, p. 63. Type Mus rattus Linn. 



(nee Rattus Donovan, 1827). 

 Epimys (Epinomys) Trouess., Bull. Soc. d'Etudes Sci. Angers, 



1881, X, p. 117. 



In a paper published in the Proceedings of the Biological Society 

 of Washington, Vol. XXIII, 1910, p. 57, on "The Generic name of 

 the House Rats," Mr. G. S. Miller, Jr., shows that the term Epimys 

 (Epinomys) Trouessart should be applied to the House Rats, of which 

 by tautonymy, Rattus domesticus Fitzinger = M us rattus Linn., is the 

 type; and that Mus musculus should typify the genus Mus Linnaeus. 1 



The introduced species occurring in North America would there- 

 fore stand as follows : 



1 [Since the above was written by Dr. Elliot further research has shown that 

 Rattus Fischer, 1803, antedates Epimys for the same group by many years. (Cf. 

 Hollister, Proc. Biol. Soc. Washington, XXIX, p. 206, and the references there cited.) 

 EDITOR.] 



