Vol. XVI, pp. 47-48 March 19, 1903 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



TWO NEW WOOD RATS (GENUS KEOTOMA) FROM 

 STATE OF COAHUILA, MEXICO. 



BY C. HART MERRIAM. 



Among the mammals collected by E. W. Nelson and E. A. 

 Goldman in Coahuila, Mexico, in the spring of 1902, are two 

 new species of JVeotoma, which may be characterized as follows. 



Neotoma navus, sp. nov. 



Type from Sierra Guadalupe, Coahuila, Mexico. No. 116,895, 9 ad., 

 U. S. National Museum, Biological Survey Collection. April 26, 1902.' 

 E. W. Nelson and E. A. Goldman. Original No. 15,130. 



Characters. — Size medium; tail rather long; ears medium. Similar to 

 N. mexicana but tail decidedly longer; frontals expanded posteriorly un- 

 like the previously known members of the mexicana group; anterior lobe 

 of first upper molar cut in two by deep notch on inner side, as in mexi- 

 cana. 



Color. — Ground color of upperparts buffy ochraceous, moderately, 

 evenly, and rather inconspicuously lined with black hairs; sides of face 

 buffy ochraceous, the color reaching forward to nose (not stopping under 

 eye as in mexicana); fore feet from wrists and hind feet from ankles 

 white; head grayish; tail sharply bicolor, narrowly dusky above, broadly 

 white below; underparts white, the plumbeous underfur showing 

 through posteriorly; axillfe salmon. 



Cranial characters. — Skull and teeth rather slender, about as in N. 

 mexicana, which appears to be its nearest relative; bullae small; pre- 

 maxilhe exceeding nasals. The skull differs from that of mexicana in 

 14— Proc. Biol. Soc. Wash. Vol. XVI, 1903. (47) 



