VOL. XV, PP. 41-50 MARCH 5, 1902 



PROCEEDINGS 



OF THK 



BIOLOGICAL SOCIETY OF WASHINGTON 



TWENTY NEW POCKET MICE (HETEROMYS AND 

 LIOMYS) FROM MEXICO. 



BY C. HART MERRIAM. 



E. W. Nelson and E. A. Goldman, in the course of their 

 field work in Mexico for the Biological Survey of the U. S. 

 Department of Agriculture, have collected upwards of 800 

 specimens of Pocket Mice belonging to the old genus Heter- 

 omys. A preliminary study of this rich material has resulted 

 in the division of the group into two genera, and in the dis 

 covery of a new subgenus and twenty apparently new species 

 and subspecies. These are here described. I am indebted to 

 my assistant, Mr. Goldman, for going over the material and 

 arranging the very large series of specimens by localities, and 

 roughly by species, before I undertook the study of the group. 



Heteromys goldmani sp. nov. 



Type from Chicharras, Chiapas, Mexico. No. 77,576 $ ad. U. S. 

 National Museum, Biological Survey Collection. Collected Feb. 7, 1896 

 by E. W. Nelson and E. A. Goldman. Original No. 9244. 



Characters. Size very large; tail long and nearly naked, much longer 

 than head and body; pelage coarsely hispid; sole of hind foot naked, 

 6-tuberculate. 



Color. Upperparts dusky gray, darkest on back and head; underparts, 

 9 BIOL. Soo. WASH. VOL. XV, 1902. (41) 



