i66 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. X. 



Characters. A relatively small Phyllotis with a rather long tail, 

 small ears, and a slender elongate skull. Color about as in P. andium; 

 upper parts pale clay color mixed with dusky and toned somewhat by 

 the slaty under color in a specimen not very heavily pelaged; under 

 parts dull white tinged with creamy; feet white; tail bicolor; ears 

 buffish gray. Skull small and slender; nasals long; interorbital space 

 contracted; f rentals relatively narrow posteriorly; supraorbital edges 

 slightly rounded, not sharply edged as in P. amic.us; braincase shallow; 

 interparietal distinctly angled posteriorly; teeth about equal in size 

 to those of P. amicus; audital bullas smaller. 



Measurements. Type : Total length 217; head and body 99 ; tail 

 118; hind foot 24; ear from notch (dry) 16. Skull of type: Greatest 

 length 25.6; basilar length 20; zygomatic breadth 12.8; interorbital 

 constriction 3.8; greatest dorsal breadth of parieto-frontal suture 6.7; 

 depth of braincase including audital bullae 8.5; interparietal 8.8 x 2.7; 

 nasals 10.3 x 2.8; palatine foramina 6.2; diastema 7; upper toothrow 4.1. 



Remarks. The type of this species was obtained at the same locality 

 as the peculiar Oryzomys polius. It is smaller than P. andium and P. 

 haggardi and scarcely exceeds P. amicus from which its small ears readily 

 distinguish it. Possibly its nearest relative is Phyllotis elegantulus 1 

 the type of which is supposed to be from Pallatanga, Ecuador," and, 

 although described recently, was collected more than 50 years ago. It 

 is evident, however, that even if liberal allowance be made for the 

 unreliability of measurements taken from an old alcoholic specimen, 

 P. elegantulus is still smaller than the species here described, the tail 

 length being given as 70 and the hind foot as 2 1 . 



Phyllotis amicus Thomas. 



Seven specimens, Menocucho. 



This small series was obtained among rocks and thorny bushes a few 

 rods beyond the canefields and irrigated areas. Average measurements 

 of five adults are: Total length 191 (182-198); head and body 82 (74- 

 87); tail 107 (100-112); hind foot (c. u.) 22.2 (22-23); ear from notch 

 (dry) 19.5 (18.5-21). 



Eligmodontia sorella Thomas. 



Two specimens from an elevation of about 1 1 ,000 feet in the moun- 

 tains directly northeast of Otuzco agree closely with the description of 

 this species except that their skulls have slightly larger dimensions than 



1 Thomas, Ann. & Mag. Nat. Hist., (8), XI, p. 139, 1913. 



