33^ Bulletin American Museum of Natural History. [Vol. V.] 



skull is of the heavy, short, broad type of G. hispidus? with the 

 malar greatly expanded. The coloration of the animal, however, 

 is much darker, especially below ; the pelage is rather soft and 

 not hispid, and the tail is relatively much longer than in hispidus. 

 The white patch on the crown is possibly albinism, but if normal 

 is a striking feature. 



In addition to the differences in external characters and in size, 

 G. chcrriei differs from G. hispidus in several important cranial 

 details, notably in respect to the shape and size of interparietal 

 bone, which in G. hispidus is broad and short (much broader than 

 long), and gently convex in front, while in G. cherriei it is narrow, 

 subtriangular, and nearly twice as long as broad. 



Possibly this species may need comparison with Geomys heterodus 

 Peters, from Irazu, Costa Rica ; but Alston says (Biol. Cent. Am., 

 Mam., p. 1 60) that Peters's type "proves identical with Mexican 

 specimens." 



1 I am indebted to Dr. C. Hart Merriam, Chief of Division of Ornithology and Mammalogy, 

 U. S. Department of Agriculture, for a specimen of G. hispidus for comparison in the present 

 connection. Dr. Merriam writes me that this specimen "may be regarded as a duplicate type 

 [of G. hispidits\, since it was collected at a point probably not more than six miles from the 

 exact spot where the original type was obtained." 



