1914.] NATURAL SCIENCES OF PHILADELPHIA. 9 



ON A COLLECTION OF MAMMALS FROM ECUADOR. 

 BY WITMER STONE. 



Mr. Samuel N. Rhoads made a collecting trip to Ecuador, February- 

 July, 1911, and secured a valuable series of vertebrates. His entire 

 collection was purchased by the Academy of Natural Sciences of 

 Philadelphia, and reports on the fishes and reptiles have already 

 appeared in the Proceedings.^ The mammals, comprising sixty- 

 eight specimens, referable to nineteen species, were obtained for the 

 most part on the paramo and the region immediately below, on 

 Mt. Pichincha, 10,000-13,000 feet, while a few additional specimens 

 were obtained from the mountains above Chambo, from the Pagma 

 forest near Chunchi, 7,000 feet, and from Bucay, province of Guayas, 

 975 feet. 



As the Academy previously possessed no mammals whatever from 

 the Andes, the satisfactory identification of much of Mr. Rhoads' 

 material was rendered impossible until such specimens could be 

 secured for comparison. Upon his return from Peru, Mr. Wilfred H. 

 Osgood, being anxious to make comparisons with certain Ecuador 

 species, generously offered to compare Mr. Rhoads' specimens with 

 the series in the Field Museum in return for their use in the identifica- 

 tion of his Peruvian mammals. This he has done and has given me 

 his opinion as to their relationships. 



The American Museum has, through Dr. .J. A. Allen, curator 

 of mammals, loaned me specimens of Blarina thomasi and B. squami- 

 pes for purposes of comparison and the U. S. National Museum a. 

 series of Scinrus hoffmanni. 



For this aid I would extend my sincere thanks especially to Mr. 

 Osgood, without whose co-operation this paper could not have been 

 prepared. 



Mr. Rhoads has kindly furnished me with some field notes on 

 Ccenolestes and other interesting species which are duly credited. 



1. Ichthyomys soderstromi de Winton. 



Ichthyomys soderstromi de Winton, Proc. Zool. Soc. London, 1896, p. 507. 



Two specimens of this interesting fish-eating rodent were obtained 

 from Mr. Soderstrom, of Quito, who collected the type specimen on 



11911, p. 49.3; 1913, p. 1.53. 



