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. 



j\rr. \\. W. Brown Jr.'s collection from Santa Marta, Colombia, 

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

 s))ecimens of both species to Mr. Oldfield Thomas, who has, 

 with great kindness, compared them with the material in the 

 British JNIuseum. One species is 0. <lry<is humilior Thomas, 

 oi'iginalLy described iVom Bogota. The other, although near 0. 

 falvescens Allen and Chapman, from Jalaj)a, Mexico, proves to 

 be new. Of 0. dryns 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, 

 may always be known by its darker colors and rich fulvous 

 under parts. 'I'he new form mn}' be known from the following 

 description : 



Oryzomys navus* sp. nov. 



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

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

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



General characiers. — Apparently nearest 0. fulvescens Allen and Chap- 

 man from Jalapa, ]\Iexico, 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., Vol.. XI ri, 1899 (9) 



