162 Annals of the Carnegie Museum. 



assumed for the remaining forms is an open question. At all events, 

 negative evidence must count for little at present, and the chances are 

 that, other conditions being equal, the majority of the species of this 

 latter category extend their range to the Isle of Pines. Some of them, 

 indeed, have even been reported therefrom, on what appears at present, 

 however, to be insufficient grounds. 



The avifauna of Cuba itself, it may be noted in passing, is not en- 

 tirely homogeneous, there being at least si.x cases (two of which are 

 pointed out for the first time in the present paper) where the eastern 

 and western parts of the island respectively are inhabited by different 

 although closely allied forms of certain birds. Without exception in 

 such cases the Isle of Pines bird is like that of western Cuba. So 

 that, while we might perhaps be inclined to accept "the theory of iso- 

 lation as the dominant factor in the development of the distinctive 

 races of the Isle of Pines, it is evident that such an explanation will not 

 account for the differentiation of two distinct forms in Cuba. It is 

 altogether likely, therefore, that the actual difference in environmental 

 conditions in the Isle of Pines, as evidenced in its peculiar physio- 

 graphic and climatic features, as compared with those of Cuba, has 

 had more to do in the evolution of its several indigenous forms of 

 birds than mere segregation. 



List of Localities. 



In order to facilitate the use of the map which accompanies this 

 report in studying the local distribution of the avifauna, all the locality 

 names appearing in the text are here duly listed, with a brief indication 

 of their position and application. The American invasion of the 

 island is responsible for the confusing mixture of English and Spanish 

 names. Certain names appearing in IMessrs. Bangs and Zappey's 

 paper, too, are incorrectly spelled, while others are of more or less 

 uncertain application. A map furnished by Mr. Link, showing his 

 route and collecting-stations, happily puts his work on a much better 

 basis in this respect. 



Almacigos. — More properly Los Almacigos, which see. 



Arroyo del Pino {Pine River). — A river in the western part of the 

 main island, visited by Mr. Read on a few occasions. 



Arroyo (" Rio ") Santiago. — A small river or creek flowing into the 

 Cienaga near its eastern end, referred to by Mr. Zappey. 



Bihijagua (or Vivijagua). — A town-site, with a hotel and several 



