No. 8. — The Mammals and Birds of the Pearl Islands, 

 Bay of Panama} 



By John E. Thayer and Outram Bangs. 



CONTENTS. 



Page 



I. Introduction. By Outram Bangs 137 



II. Literature. By Outram Bangs 139 



III. List of the Mammalia. By Outram Bangs 139 



IV. Aves. By John E. Thayer and Outram Bangs 140 



I. Introduction. By Outram Bangs. 



Daring the John E. Thayer Expedition of 1904 Mr. W. W. Brown, Jr., 

 made a second visit (his first expedition to the islands having been made 

 in the spring of 1900) to the Archipelago de las Perlas in the Bay of 

 Panama. Here he remained, collecting assiduously, for two months, 

 — from the latter part of February to the latter part of April, 

 1904. 



On his first trip, in 1900, Mr. Brown devoted much time to collecting 

 mammals, and took specimens of probably every species that occurs 

 in the islands, with the possible exception of some bats. He felt, how- 

 ever, that there were many birds in the islands of which he failed to 

 secure representatives. The birds taken on the first expedition were 

 also, many of them, in poor plumage, — some so worn and faded as to 

 be misleading. On the first trip, also, Mr. Brown collected only in San 

 Miguel Island, and took no reptiles or amphibians. It therefore seemed 

 desirable that a second visit should be made. 



On the present trip Mr. Brown collected on San Miguel, Saboga, and 

 Pacheca Islands. The biota of all three is similar, and no species taken 

 has differentiated on the several islands, owing to their closeness. San 

 Miguel, being the largest island of the group, has the richest fauna, and 

 many species occur there that are not found in the other islands. 

 Saboga is the " bird rock " of the group, and here cormorants, boobies, 

 mau-o'-war birds, and terns breed in great numbers. 



1 Papers from the John E. Thayer Expedition of 1904, No. 2. 



