VOL. XIII, PP. 9-10 JANUARY 31, 1899 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW PIGMY ORYZOMYS FROM THE SANTA MARTA 

 REGION OF COLOMBIA. 



BY OUTRAM BANGS. 



Mr. W. W. Brown Jr.'s collection from Santa Marta, Colombia, 

 contains series of two species of pigmy Oryzomys. I have sent 

 specimens of both species to Mr. Oldfield Thomas, who has, 

 with great kindness, compared them with the material in the 

 British Museum. One species is 0. dry as humilior Thomas, 

 originally described from Bogota. The other, although near 0. 

 fidvescens Allen and Chapman, from Jalapa, Mexico, proves to 

 be new. Of 0. dryas humilior Mr Brown took twelve specimens, 

 all at Macotama (alt., 8000 ft.). Of the new form he took ten 

 specimens at Palomina (5000 ft.), Pueblo Viejo (8000 ft.), and 

 San Miguel (7500 ft.). 



The two forms are very different ; 0. dryas humilior, the larger, 

 ma\r always be known by its darker colors and rich fulvous 

 under parts. The new form may be known from the following 

 description : 



Oryzomys navus* sp. nov. 



Type from Pueblo Viejo, Sierra Nevada de Santa Marta, Colombia. 

 No. 8107, c? adult, coll. of E. A. and O. Bangs. Collected March 26, 1898, 

 by W, W. Brown, Jr. Altitude, 8000 feet. 



General characters. Apparently nearest 0. fulvescens Allen and Chap 

 man from Jalapa, Mexico, differing in longer tail, smaller ears, paler, 

 more yellowish coloration and purer white under parts. Skull not show 

 ing any marked differences from skulls of other members of this group, 



* Navus, diligent, active. 



2 BIOI-. Soc. WASH., VOT.. XIII, 1899 (9) 



