PROCEEDINQS 



OF THE 



WASHINGTON ACADEMY OF SCIENCES 



Vol. Ill, pp. 559-563. November 29, 1901 



SEVEN NEW MAMMALS FROM MEXICO, IN- 

 CLUDING A NEW GENUS OF RODENTS. 



By C. Hart Merriam. 



Among the remaining undescribed mammals collected in 

 Mexico by E. W. Nelson and E. A. Goldman, while engaged 

 in field work for the Biological Survey of the U. S. Depart- 

 ment of Agriculture, the following seven appear to be of more 

 than ordinary interest. 



BLARINA MAYENSIS sp. nov. 



Typelrom a Maya ruin at Chichenitza, Yucatan. No. 10S0S7. 9 ^^' 

 U. S. National Museum, Biological Survey Coll. February 5, 

 1901. E. W. Nelson and E. A. Goldman. Orig. no. 14495. 

 Characters. — Similar in general to mexicana but pale plumbeous 

 or slaty instead of blackish; unicuspidate teeth larger and broader. 



Color. — Upperparts plumbeous, darker on nose ; back with fine 

 'pepper and salt ' appearance ; underparts plumbeous, overlaid with 

 ash brown, strongest on throat and breast. 



Cranial characters. — Skull similar to that of mexicana but slightly 

 longer and less massive; braincase lower (practically continuing plane 

 of rostrum) ; molariform teeth large and full, not excavated anteriorly 

 or posteriorly; large premolar smaller than that of vtexicanus; ist 

 and 2d unicus^Dids large and swollen, much larger than those of mexi- 

 canus^ and with inner tubercle obsolete, in this respect resembling 

 pereffrina. 



Measurements. — Type specimen ( $ ad.): total length 102 mm.; 

 tail vertebrai 29; hind foot 13. 



Proc. Wash. Acad. Sci., Nov., 1901. 559 



