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Oct., 1915. MAMMALS FROM BRAzIL AND Peru — Oscoop. 191 
nearly vertical as in Phyllotis, not decidedly flexed forward in its lower 
half as in Euneomys; palatal pits and foramina practically as in Phyllotis; 
tail shorter than head and body as in Euneomys. 
Remarks:— Some of the species of this group have been referred to 
Phyllotis and others to Euneomys and it is clear that although they have 
affinities to both, they should have some collective recognition. On 
the whole, they have more of the characters of Phyllotis than of Eune- 
omys and it seems best therefore to regard the group as a subgenus of 
Phyllotis. The species referable to it with certainty are: Phyllotis 
sublimis Thomas, P. pictus Thomas, P. boliviensis Waterhouse, P. b. 
flavidior Thomas, and P. decoloratus sp. nov. 
Phyllotis (Auliscomys) decoloratus sp. nov. 
Type from Tirapata, Dept. Puno, Peru. No. 16500 American 
Museum of Natural History. Adult female. Collected October 21, 
“1900, by H. H. Keays. 
Characters:— Similar to Phyllotis pictus but smaller and paler; 
somewhat similar to P. boliviensts but decidedly smaller, especially the 
ears and feet, and with the color of the ears and the rump more con- 
trasted with that of the body. General distribution of color practically 
as in P. pictus but paler throughout, the rump inclining to buffy rather 
than tawny, the head and shoulders a paler grayish and the feet entirely 
white without traces of ochraceous; inside of ears pale ochraceous buff 
well-contrasted with the surrounding grayish, but much paler than the 
rich tawny of P. pictus. 
Skull decidedly smaller and relatively narrower than that of P. 
pictus; upper incisors distinctly grooved and rather pale in color. 
Measurements:— Type and adult male topotype, respectively: 
Total length 178, 216; head and body 95, 114; tail 83, 102; hind foot 23, 
25; ear from notch (dry) 17, 18. Skull of type: Greatest length 26.6; 
basilar length 20.9; zygomatic breadth 15.4; least interorbital breadth 
4.2; nasals 10.44; breadth of braincase 12.6; diastema 7; palatine 
foramina 6.4 2; upper toothrow 5.1. 
Remarks:— I am indebted to Dr. J. A. Allen for the privilege of 
examining the type and several additional specimens of this species from 
the collection of the American Museum of Natural History. These 
were at first supposed to represent P. boliviensis, but examination of the 
original description of that species in connection with a topotype 
kindly loaned by Mr. G. S. Miller, Jr., of the United States National 
Museum indicates that this is far from the case. P. boliviensis, as 
