2 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 60 



ment at the mouth of the Rio Cupe. From this point I proceeded 

 overland by the tramroad of the Darien Gold Mining Company, Ltd., 

 to the mines 30 miles southwestward at Cana. The mines are situ- 

 ated at 2,000 feet altitude on the southeastern slope of the mountains 

 and afforded a convenient base for work in the general region. The 

 time from April 12 to May 6 was spent in the vicinity of a tem- 

 porary camp at about 5,000 feet altitude on the headwaters of the Rio 

 Limon near the summit of Mount Pirri. 



The collections of natural history specimens, consisting mainly of 

 about 800 birds and 595 mammals, show that eastern Panama is 

 South American in general faunal character. Representatives of 

 numerous groups of both classes not previously known from Panama 

 are found to occur, and along with them a few recognized as North 

 or Middle American, such as the mammalian genera Peromyscus and 

 Macrogeomys, are extended from their known ranges in extreme 

 western Panama. A number of the birds and mammals obtained 

 proved to be undescribed. The new birds are being published by Mr. 

 E. W. Nelson. Fourteen new species and subspecies of mammals 

 are described below. 



In the prosecution of the work the officials charged with the 

 administration of the Canal Zone and Panama Railroad have rendered 

 the same courteous and active assistance as last year. Special 

 acknowledgments for aid are due to the Darien Gold Mining Com- 

 pany, Ltd., which, through the kindness of its managers and di- 

 rectors, Messrs. M. Masse, M. Degoutin and G. Michel at Cana. 

 and agents at various stations — Mr. Pablo Pinel at Panama, Mr. P. 

 Campagnani at Marraganti and others facilitated the field operations 

 in eastern Panama. To Mr. Samuel Henshaw I am indebted for the 

 loan of topotype material, for comparison, from the Bangs Collection 

 in the Museum of Comparative Zoology. 



PERAMYS MELANOPS, sp. nov. 



Type from Cana (altitude 2,000 feet), in the mountains of eastern 

 Panama. No. [79609, male adult, I'. S. National Museum (Biologi- 

 cal Survey Collection), collected by E. A. Goldman. May 23. 1912. 

 Original number 21737. 



General characters. — Size medium: form robust; pelage short and 

 velvety; color very dark; ears large. 



Color. — Upper parts in general very dark brown, suffused with 

 cinnamon on cheeks and sides of neck, becoming blackish on face, 

 sh< ulders and lower part of back; throat and sides of belly mousi 



