272 Bulletin American Museum of Natural History. [Vol. XVI, 



feet, 4 specimens; Huacapistona and Perene, Depart, of Junin, 

 altitude, 6000-7000 feet, 3 specimens; Limbona, Depart, of Puno, 

 altitude 6700 feet, i specimen; Surco and San Mateo, Depart, of 

 Lima, altitude 7000 to 9000 feet, 2 specimens; Carao, Depart, of 

 Cajamarca, altitude 6000 to 7000 feet, 2 specimens (coll. Brit. Mus.). 



Bolivia: Depart, of La Paz, altitude 4000-9000 feet, 3 specimens 

 (coll. Brit. Mus.). 



Total, 23 specimens, nearly all from altitudes above 5000 feet. All 

 are in the wholly black phase except one. 



D. paraguayensis pernigra differs from true paraguayensis in 

 the greater extent of the black face markings, the median 

 stripes beginning further forward, and the eye-stripes being 

 broader and extending forward almost to the naked muzzle. 

 The ears are, in the typical phase, entirely flesh-color; a few 

 specimens from other localities, here referred to this form, 

 show a tendency to dusky mottling at the base. The general 

 size of the animal is rather larger, and the tail relatively longer 

 than in paraguayensis, while the ears are smaller and much 

 more hairy. 



This appears to be the only form of Didelphis inhabiting 

 central and southern Peru. Tschudi also mentions only one 

 species of true Didelphis as occurring in Peru, which he says 

 is found in all parts, but especially in western Peru. He 

 speaks of it as reaching an altitude of 12,500 feet, but as 

 being absent from the hot forest region, and rare on the 

 eastern slope of the Coast Range at 6000 feet. His descrip- 

 tion of the species, however, is obviously compiled from 

 Temminck and not based on Peruvian specimens, he even 

 copying Temminck 's erroneous description of the ears - 

 "schwartz-braun, an der Basis smutzig weiss." 



Didelphis paraguayensis andina, subsp. nov. 



Didelphis azarcs TOMES, P. Z. S. 1860, 268. Cuenca, Ecuador. 



Type, No. 99-12-7-6, British Museum, $ ad. Loja, Ecuador, 

 June 2, 1899; coll. P. O. Simons; original number 352. 



Geographical Distribution. Andes of Ecuador, from 6000 feet to 

 12,000 feet altitude, and probably southward into northern Peru. 



Gray phase. Above varied black and white; long bristly over- 

 hair abundant, pure white; underfur white, very broadly tipped with 

 intense black, involving about the apical third of the longer fibres; 



