Feb. 23 BANGS — SANTA MARTA MAMMALS 95 
1900 
tant characters the group differs little from true Orxyzomys, but 
the small size and very delicate build throughout, including the 
skull, distinguish its members from the large rat-like species, with 
heavy ridged skulls, of true Oryzomys. 
Oryzomys (Oligoryzomys) navus Bangs. 
Oryzomys navus Bangs, Proc. Biol. Soc. Wash., Vol. XIII, p. 9, 
Jan. 31, 1899. 
Type locality: Pueblo Viejo, 8000 feet altitude, Colombia. 
Twenty-five specimens from Pueblo Viejo, San Antonio, La 
Concepcion, and Chirua,— 3000 to 8000 feet altitude. 
This little species presents a good deal of individual variation 
in color, some specimens being much redder above than others. 
Oryzomys (Oligoryzomys) dryas humilior Thomas. 
Type locality: Plains of Bogota, Colombia. 
Seventeen specimens from Macotama and E] Mamon. 
I had this pretty pigmy oryzomys described in manuscript, and 
was just about to publish it, when Dr. Thomas’s description 
appeared. I at once sent him specimens for comparison with his 
type. He wrote back that the Santa Marta and Bogota animals 
were identical. Some of my specimens are rather larger than the 
measurements given for the type, and in size approach true O. 
dryas. ‘The largest specimen in our series, a very old male from El 
Mamon (near San Sebastian), no. 8231, measures: total length, 
222; tail vertebrae, 130; hind foot, with claw, 24; ear, from 
notch, 13. The series shows a wide range in color, some speci- 
mens being very reddish above. O.dryas humilior and O. navus 
are of quite a different color, yet the range of color variation in 
the two series is the same. 
Oryzomys (Zygodontomys) phzopus obscurior Thomas. 
Oryzomys pheopus obscurior Thomas, A. N. H., Vol. XIV, p. 
355, 1894. 
Type locality: Concordia, Meddelin, Colombia. 
Ninety specimens, of all ages and every season, from Pueblo 
