gS Field Museum of Natural History — Zoology, Vol. X. 



a name. For convenience it might be compared to O. xanlhaolus 

 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 sUghtly differ- 

 entiated subspecies of xanthaolus. 



Cavia atahualps sp. nov. 



Type from Cajamarca, Peru. Alt. 9100 ft. No. 19480 Field 

 Museum of Natiiral History. Female adult. Collected April 14, 191 2, 

 by W. H. Osgood and M. P. Anderson. 



Characters. Size large; color dark; allied to C. cutleri 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 b}- 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 wdth svirrounding 

 parts; no definite eye ring. 



Skull similar to that of C. cutleri, but audital bullae somewhat larger. 



Measurements. Type ( ? ) : Total length 275 ; hind foot 48. Topo- 

 type (c?): Total length 243; hind foot 46. Sloill of type: Greatest 

 length 60; basilar length 48.3; zygomatic breadth ^^-j nasals 19.8 x 8.6; 

 diastema 16.2; palatal foramina 6; length of toothrow (alveoU) 14.6. 



Remarks. As represented by a specimen from Arequipa, Cavia 

 cutleri 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 imder 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 bullae. 



Akodon mollis orophilus subsp. nov. 



Type from six miles west of Leimabamba, Peru (in mountains near 



