76 MACROQEOMYS ZYGOGEOMYS DICROSTONYX LEMMUS. 



Macrogeomys dolichocephalus Merriam. 



North AiiKT. Fauna, No. «, p. ISi), pi. r>- pi. 10, iia. 7; i>l. ^^^, i\i:. 19, January 31, 

 1895. 



sVsVs- ^1^J>^ {i»^l skull. Adult niiilc. San Joso, Co.>^ta Rica. Janu- 

 aiT, 18(56. Collected l)y flose C. Zeledon. Explorations in Costa 

 Rica under Dr. A. Von Frantzius. Skin catalogued Novend>er 0, 

 1866; skull, October 31, 1893. 



Skin not very well made up, 1)ut apparently in good condition; skull nearly 

 perfect, .somewhat damaged about pterygoids, and a (juadrangular hole is in 

 supraoccipital, running up from foramen magnum. 



Genus ZYGOGEOMYS. 

 Zygogeomys trichopus ]\Ierriaui. Biological Survey collection. 



North Ainer. Fauna, No. S, i)p. liXMOS, pi. (i; pi. 13, fig. 24; ]>\. 14, fig. 1; jtl. In, 

 lig. 10, January 31, 1895. 



50107. Skin and skull. Adult male. Nahuatziii, Michoacaii. Mexico. 

 October 11, 1892. Collected by E. W. Nelson. Original number 

 3571. 



Well-made skin in good condition; skull pcrfi'ct. 



Family MFRID.E. 

 Genus DICROSTONYX. 

 Dicrostonyx unalascensis ^Nlerriam. r)i()logical Surve}' Collection. 

 Troc. Wash. Acad. Sci., II, ]>. 25, :\Iarcli 14, 1900. 

 !»9<;2l>. Skull oidy. Adult. Unalaska, Alaska. July 8, 1899. Col- 

 lected by Dr. C. Hart Merriam. 

 Nearly perfect skull from owl pellet. 



Genus LEMMUS. 

 Lemmus minusculus Osgood. • Biological Survey collection. 



North Amcr. Fauna, No. 24, pp. 36-37, November 23, 1904. 

 119612. Skin and skull. Adultmale. Kakhtul Rivc'r, near mouth of 

 Malchatna River, Alaska. September 1, 1902. Collected by W. H. 

 O.siTood iuid A. G. Maddren. Original iuuu])er 1903. 

 Well-made skin in good condition; skull perfect. 



Myodes nigripes True. 



Diagnoses of New North American INIammals, p. 2, April 2(3, 1894. (Reprinted 

 in Troc. U. S. Nat. Mus., XVII, No. 999, p. 242, November 15, 1894.) 

 = Lemmus nigripes (True). See Miller, North Amer. Fauna, No. 12, p. 37, July 



23, 189(J. 

 59152. Skin and skull. Adult male. St. (Jeorge Island, Alaska. 

 August 18, 1892 (or 1893). C'ollectcd by C. H. Townsend, U. S. 

 Bureau of Fisheries steamer Alhafross. Catalogued February 5, 

 1894. 



Well-madi^ skin in good condition; skull with part of left zygoma and both 

 coronoid processes of mandil)le absent; otherwise jierfect. 



