96 BANGS — SANTA MARTA MAMMALS [Poe 
Viejo, San Miguel, Palomina, Chirua, and La Concepcion,— 3000 
to 8000 feet altitude. 
This series shows a wide range of variation in color, partly due 
to season, partly individual, from very dark-colored specimens, 
as dark as true pheopus or pheopus obscurior, to some as light 
above as Allen describes his O. sanctemarte. Dr. Thomas com- 
pared specimens I sent him with his types, and pronounced them 
the same as his O. phaeopus obscurior, with the remark, “ Your 
specimens are rather brighter, but so much better as skins that the 
difference appears to be due to that fact. Otherwise they are 
exactly the same.” I had many examples much duller in color 
than those I sent. 
In proportions my specimens agree exactly with the form just 
described by Allen as O. sanctemarte’ from the lowlands, sea 
level to 500 feet, near Santa Marta, but I have not a single 
individual in my large series with the under parts “entirely clear 
whitish gray.”’ The under parts in all my specimens are of a 
color very similar to the upper parts, except that there are no 
blackish brown tips to the hairs below. Without seeing Allen’s 
specimens, I suppose that they represent a different form. 
ERIORYZOMYS subgen. nov. 
(MURIDA: CRICE TINA) 
Type: Oryzomys monochromos sp. nov. 
Characters.— Somewhat intermediate between Oryzomys and Akodon ; pel- 
age very long, full and fluffy; hairs of back 12 mm. or even longer; fifth hind 
toe very long; hind foot short; skull large, very lightly built and papery; 
brain-case large and wide; no superciliary beading, whatever; zygomatic plate 
shaped like that of Afodon, i. e., narrow and slanting backward from bottom, 
in front (very different from the strong forward curve of the front of the zygo- 
matic plate of true Oryzomys); upper outline of skull viewed in profile nearly 
straight; incisive foramina wide and short; mandible slender and weak; 
molar teeth essentially as in true Oryzomys; incisor teeth small and weak. 
(Plate I, fig. 3.) 
Remarks.—This group is very different in all its characters from 
true Oryzomys, except that the molar teeth are very similar; it 
therefore seems best to regard it as only a subgenus. 
1Oryzomys sanctemarte Allen, Bull. Amer. Mus. N. H., Vol. XII, pp. 207-208, Dec. 20, 
1899. ‘Type locality: Bonda, Santa Marta District, Colombia. 
