1915.] Allen, New South American Mammals. 629 
the immediate vicinity of the mouth of Rio Madeira as the type locality of 
Dasyprocta croconota. 
The D. croconota group ranges northward to the Guianas and Venezuela 
(Orinoco basin), both of which regions are represented by specimens of this 
group in the American Museum. Some of the Venezuela specimens are 
practically topotypes of Dasyprocta lucifer Thomas, which form I believe 
should be known as Dasyprocta croconota lucifer. The Guiana specimens, — 
a series of 6, are from northern British Guiana, and seem to be distinctly 
referable to D. prymnolopha. They also agree satisfactorily with Thomas’s 
description of his Dasyprocta lucifer cayenne, with which I had identified 
them before I took up the case of D. prymnolopha. It seems to me now, 
however, that the “ Guiana’’ form should be known as Dasyprocta croconota 
prymnolopha, unless more than one form should be found to exist in the 
Guianas, when it would be necessary to designate a definite type locality 
for Wagler’s prymnolopha, which may or may not have come from Cayenne. 
Proechimys kermiti sp. nov. 
Type (and only specimen), No. 37124, 9 ad., Lower Rio Solimoens, April 20, 
1914; Leo E. Miller. Roosevelt Brazilian Expedition. 
Named for Kermit Roosevelt, in recognition of his important contributions to 
the natural history results of the Roosevelt Expedition. 
Similar in size to Proechimys centralis, but with the underparts buffy drab instead 
of clear white, and important cranial differences. 
Upperparts ochraceous buff lined with black, paler on the head, shoulders, and 
outer surface of limbs, brighter on the sides, darker on the middorsal region where 
black prevails from a little behind the shoulders to the rump, forming a broad black- 
ish band; lower parts pale buff on throat and middle of the ventral surface, passing 
into drab laterally, and thence merging into the color of the upperparts, without 
a sharp dividing line between the sides and the ventral surface; outside of limbs 
like sides of body; inside of fore limbs like the breast, inside of hind limbs with a 
broad longitudinal band of strong buff; feet dull brown, rather thinly haired. 
Head and body, 310 mm.; tail absent, having been shed in life; hind foot, 55. 
Skull, total length, 65.5; zygomatic breadth, 29.5; interorbital breadth, 13.5; 
parietal breadth, 22.3; length of nasals, 28 x 6; diastema, 13; maxillary toothrow, 9. 
Nasals very broad, bluntly pointed posteriorly and extending back to a line | 
transverse to the anterior border of the orbital fossx; frontals with a heavily thick- 
ened border, continued over the front half of the parietals; maxillary toothrows 
perfectly parallel, not converging anteriorly as in most species of the genus. 
This is one of the largest species of the genus, about equalling P. centralis 
in size, but differing from it externally in the upper parts being darker and 
paler with a much stronger dark median band, and in the underparts being 
mixed buffy and drab. The upperparts are nearly like the upperparts in 
