98 Fretp Museum or Naturat History — Zoo.ocy, Vor. X. 
a name. For convenience it might be compared to O. xantheolus 
which is only slightly smaller but that species has the usual more or 
less fulvous coloration and the skull has a different palatal and inter- 
pterygoid region, a shorter rostrum, and various minor characters not 
shown by the present species. O. baroni appears to be a slightly differ- 
entiated subspecies of xanthe@olus. 
Cavia atahualpz2 sp. nov. 
Type from Cajamarca, Peru. Alt. gtoo ft. No. 19480 Field 
Museum of Natural History. Female adult. Collected sas 14, 1912, 
by W. H. Osgood and M. P. Anderson. 
Characters. Size large; color dark; allied to C. wlan but much 
darker; general color of upper parts evenly grizzled cinnamon and 
blackish, the bases of the hairs broadly dark drab (15-20 mm.) followed 
by two or more annulations of cinnamon and blackish; numerous very 
fine and wholly blackish hairs more or less exserted especially on the 
rump where they are 20-50 mm. long; sides and lateral under parts 
only slightly paler than back; midventral region wood brown or pale 
cinnamon to ochraceous buff somewhat broken by drab basal color on 
belly, clearer and more dominant in pectoral and inguinal regions; 
throat mixed cinnamon and blackish scarcely different from upper parts; 
chin and submaxillary region buffy; fore and hind feet grizzled pale 
drab; ears thinly haired, blackish, not contrasted with surrounding 
parts; no definite eye ring. 
Skull similar to that of C. cutleri, but audital bullee somewhat larger. 
Measurements. Type(2): Total length 275; hind foot 48. Topo- 
type (So): Total length 243; hind foot 46. Skull of type: Greatest 
length 60; basilar length 48.3; zygomatic breadth 33; nasals 19.8 x 8.6; 
diastema 16.2; palatal foramina 6; length of toothrow (alveoli) 14.6. 
Remarks. As represented by a specimen from Arequipa, Cavia 
cullerit is decidedly paler than the present species. This difference 
exceeds possible individual variation. Four specimens were secured 
at Cajamarca and all are uniformly dark colored, although one immature 
example shows somewhat more buffy or ochraceous on the under parts 
than the adults. Various cranial differences are noticeable but the 
only one which is sufficiently marked to give promise of being more 
than an individual peculiarity is that of the size of the audital bull. 
Akodon mollis orophilus subsp. nov. 
Type from six miles west of Leimabamba, Peru (in mountains near 
