12 NORTH AMERICAN WARBLERS. 



WESTERN MIGRATION ROUTE TO MEXICO. 



The westernmost part of the great migration route between the 

 United States and the countries to the south is used by the following 

 species that migrate by land to Mexico: 



Lucy warbler {Ilelminthophila lucise). 



YiTginisL yvsirbler (Helminthophila virginise). 



Calaveras warbler {HehninthophUa rubricapilla gutturalis). 



Lutescent warbler {HelminiJiopMla celata lutescens). 



Sennett warbler { Compsothlypis pitiayumi nigrilora) . 



Olive warbler {Dendroica oUvacea). ■ 



Sonora yellow warbler [Dendroica xstiva sonorana). 



Alaska yellow warbler [Dendroica sestiva rubiginosa) . 



Audubon warbler {Dendroica auduboni). 



Black-f routed warbler {Dendroica auduboni nigrifrons). 



Grace ^Yarbler {Dendroica graci^). 



Black-throated gray warbler {Dendroica nigrescens). 



Golden-cheeked warbler {Dendroica chrysoparia) . 



Psici^c yellow-throat {Geothlypis trichas arizela) . 



Townsend warbler {Dendroica iownsendi). 



Hermit warbler {Dendroica occidentalis) . 



Grinnell water-thrush {Seiurus noveboracensis notabilis) . 



Macgillivray warbler ( Geothlypis tolmiei) . 



Western yellow-throat {Geothlypis trichas occidentalis). 



^io Grande yellow-throat {Geothlypis 2:)oliocephala) . 



Long-tailed chat {Icteria rirens longicauda). 



Pileolated warhler {Wilsonia pusill a pi leolata). 



Goldeni^ileolatedwarhler{Wilsoniapusillachryseola). 



Painted redstart {Setophaga picta) . 



Red-iaced warbler {Cardellinarubrifrons). 



The lines of migration so far given cover the principal routes by 

 which the birds of the United States reach their winter quarters. 

 There is another route which can not be mapped owing to lack of 

 data. Indeed, its existence is largely inferential. Several species 

 that occur in the Mississippi Valley and the Allegheny Mountains 

 reach Middle America in winter, but are not known regularly in 

 migration in Florida, Cuba, Yucatan, or northeastern Mexico. It is 

 thus certain that these species pass from the Mississippi Valley and the 

 Allegheny Mountains to Middle America, but the point of departure 

 from the United States and the point of arrival in Middle America are 

 not yet known. It seems probable that the birds cross directly to the 

 heav}^, damp forests that cover the lowlands of eastern Honduras, the 

 southern parts of Yucatan and Campeche, and the highlands of north- 

 western Guatemala, but not until this region, as yet unvisited during 

 the fall migration, has been thoroughly explored, can any exact knowl- 

 edge on the point be obtained. Species that appear largel}^ to use this 

 route are the following: 



