218 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 5S. 



Bingham in the National Geographic Magazine/ with illustrations 

 which show well the physical characters, the mighty mountains, and 

 stupendous river valleys of the region where the collection was made. 

 Machu Picchu is itself on the Urubamba Kiver, some 45 miles north- 

 west of Cuzco ; and while it was being explored by the archaeologists 

 of the party, Mr. Heller made collecting trips in different directions 

 from it, so that the area over which the mammal collection was 

 made extends from the Eio Comberciato, about 65 miles northwest of 

 Machu Picchu to Pucara, close to Cuzco, all the places being in 

 the drainage system of the Urubamba. A small number of speci- 

 mens were also got at La Eaya Pass, 100 miles southeast of Cuzco, 

 on the watershed dividing the upper Urubamba from the Upper 

 Pucara, which runs southeastward to Lake Titicaca. The exact 

 positions of most of the localities are shown in Professor Bingham's 

 map. 



Considering its remoteness from civilized regions and the immense 

 difficulties involved in making collections in such a place, it is cer- 

 tain that only a large and well-equipped expedition, such as that 

 under the direction of Professor Bingham, could have provided an 

 opportunity for a collector to have obtained anything like a complete 

 series of the mammals of this area. 



The collection consists of nearly a thousand specimens of all orders, 

 but it is chiefly rich in Muridae, which Mr. Heller was extremely 

 successful in capturing. In all it contains 65 species, of which I have 

 found it necessary to describe 12 as new. Short diagnoses of all but 

 one of these have been already published.' Of the novelties, by far 

 the most interesting is a new Marsupial nearly related to Coenolestes, 

 but sufficiently distinct to be regarded as a different genus. Members 

 of the family were previously known from Colombia and Ecuador, so 

 that the present is a considerable extension of the recent range of 

 the group. 



Within the area now dealt with, of which the crossing of 13° S. 

 with 72° 30' W. may be taken as the center, almost no collections of 

 mammals have been made, a couple of small series sent to the British 

 Museum by O. Garlepp in 1898 and 1903, and a few odd specimens, 

 also in the British Museum, obtained by the Polish collector J. Kali- 

 nowski, appearing to be all that are recorded, although there may 

 be a few others which I do not Imow of. In order to make the pres- 

 ent list as complete as possible I have included in it the specimens of 

 the Garlepp and Kalinowski collections, so that it contains all the 

 species as yet known from the area. Near-by regions are, however, 

 more richly represented, notably the district of Junin, where both 



^ In the Wonderland of Peru, by Hiram Bingham, Nat. Geogr. Mag., vol. 24, p. 387. 

 April, 1913. 



2 Smithsonian Miscel. Coll., vol. 68, No. 4, April 10, 1917. 



