DISTRIBUTION OF WARBLERS n 



V. chrysoptera, Pencedramus, Dendroica cwrulescens, Oporornis 

 agilis, and O. tolmiei. 



DISTRIBUTION OF WARBLERS 



The approximately one hundred and fifty-five species contained in 

 the family Mniotiltidae are distributed in summer from Argentina 

 to Labrador and northern Alaska, including the West Indies and 

 Galapagos. During the winter few species are found north of the 

 southern border of the United States. The wide range of some 

 species makes a geographical analysis of the group difficult, but by 

 allotting a species to the region in which it occupies the largest area, 

 we have the following results: 



South America 40 species 



Galapagos 10 species 



Central America and Mexico 30 species 



West Indies 20 species 



North America 55 species 



Twenty-six of the 40 South American species are contained in 



the genus Basileuterus and the remaining 14 belong to the genera 



Myioborus (9 species), Geothlypis (4 species) and Compsothlypis 



(I species). 



Nine of the Galapagan species belong in the somewhat aberrant 

 genus Certhidea, placed in this family for the first time by Mr. Ridg- 

 way, and one is a Yellow Warbler of the West Indian petechia group. 

 Central America and Mexico, omitting the northern part of the 

 tableland, have 6 species of Basileuterus, 2 of Oreothlypis, 1 of 

 Compsothlypis, 1 of Vermivora, 6 of Geothlypis, 2 of Chamx- 

 thlypis, 4 of Granatellus, 3 of Myioborus, i of Euthlypis, 2 of Erga- 

 ticus, and 2 of Rhodinocichla. 



The West Indies have 10 species of Dendroica, i of Catharopeza, 

 2 of Teretistris, i of Leucopeza, i of Microligea and 5 of Geothlypis. 

 The constitution of the 16 North American genera is stated on 

 a later page. It is evident, therefore, that, although of tropical origin, 

 the Warblers now reach their highest numerical development in Nortl' 

 America. 



Of the 16 genera of Warblers found in North America, the 

 following 7 have no species breeding south of our limits: Mnio- 

 tilta, Helinaia, Helmitheros, Protonotaria, (all monotypic), Opor- 

 ornis, Seiurus, and Wilsonia. None of the 9 species of Vermivora 

 nest south of the Mexican tableland, all but one entering North 



