208 Fretp Museum or NaturaAt History — Zoéxioey, Vor. X. 
P. domorum. In fact it seems necessary to include the species amicus 
as a peripheral member of the group Graomys and to recognize its 
connectant character by treating that group as a subgenus co-ordinate 
with typical Phyllotis. 
Akodon puer Thomas. 
One specimen, Parotani. 
This specimen agrees closely with the original description of A. 
puer, the principal discrepancy being in the color of the ears which are 
mixed grayish and dusky in some contrast to the body color. Flesh 
measurements are: Total length 169; tail 75; hind foot 20. 
Akodon varius Thomas. 
One specimen, Parotani. 
Although comparison with the type from Cochabamba would be 
desirable, there seems little reason to doubt the identity of this speci- 
men, especially since Thomas in the original description has referred to 
another from this locality. Flesh measurements are: Total length 203; 
head and body 108; tail 95; hind foot 26. 
Akodon dayi sp. nov. 
Type from Todos Santos, Chaparé River, Bolivia. No. 21329 Field 
Museum of Natural History. Adult male. Collected March 15th, 
1915 by Robert H. Becker. Original No. 784. 
Characters. Amedium-sized species of dark, rich, color. Somewhat 
allied to A. cursor but very much darker with larger hind feet and a 
heavier and decidedly deeper skull. Similar in color to A. aerosus 
baliolus, but under parts paler and more heavily washed with fulvous; 
cranial characters widely different. 
Color. Upper parts varying from Vandyke brown to burnt umber; 
middle of back scarcely or not at all darker than sides; under parts rich 
rufous; ears blackish without mixture of fulvous; feet brownish black; 
tail blackish above and below. 
Skull. As compared with that of A. aerosus, the skull is long and 
high, both incisor and molar teeth are heavier, and the braincase is 
narrower; the supraorbital edges are sharp and continuous with a 
definite ridge which crosses the parietals to the occipito-squamosal 
suture, where it turns abruptly downward and becoming more decided 
forms a sharp vertical ridge to the mastoid bulla; the occiput scarcely 
projects beyond the vertical plane of the back of the interparietal which 
is often sharp-angled behind, forming with the supraoccipital a definite 
inion; the zygomatic plate is broad and nearly vertical or slightly con- 
