Vol. XVI, pp. 79-82 May 29, 1903 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



FOUR NEW MAMMALS, INCLUDING A NEW GENUS 

 {TEANOPUS), FROM MEXICO. 



BY C. HART MERRIAM. 



E. W. Nelson, and his able assistant E. A. Goldman, in their 

 explorations in Mexico for the Biological Survey of the U. S. 

 Department of Agriculture, still continue to discover new spe- 

 cies of mammals. Four of these are here described. One is a 

 large ground squirrel quite unlike any hitherto known; another 

 is a wood rat for which I am reluctantly obliged to erect a new 

 genus; still another is a new member of the rare and little 

 known genus JYelsoma, while the last is a large pocket gopher 

 from Mt. Patamban. 



Citellus adocetus sp. now 



Type from La Salada, 40 miles south of Uruapan, Michoacan, Mexico. 

 No. 126,129 9 ad., U. S. National Museum, Biological Survey Collection. 

 March 17, 1903. E. W. Nelson and E. A. Goldman. Original No. 16,183. 



Characters. — Unique; not like any known species. Allied to Citellus 

 annulatus but much smaller and without trace of the rings on the tail. 

 Pelage hispid; ears short; tail rather long; color uniform grizzled 

 grayish or burly without markings. 



Color. — Upper parts strongly grizzled grayish and black, changing 

 with season to dull ochraceous brown; top of head usually darker (in 

 22— Proc. Biol. Soc. Wash. Vol. XVI, 1903. (79) 



