ROUTES OF MIGEATION. 13 



Blue-winged warbler {Helmlnthophila pinus) . 

 Nashville warbler (Helminthophila rubricapilla). 

 Tennessee warbler {HelminthopMlaperegrina). 

 Wilson warbler ( Wilsonia pusilla) . 



It is probable also that this route is used by many individuals of 

 the following species: 



Cerulean warbler {Dendroica cerulea). 

 Ohestnut^sided warbler {Dendroica pensylvanica). 

 Blackburnian warbler {Dendroica blachhumim). 

 Mourning warbler {Geothlypis Philadelphia). 



It seems probable that not all birds in their migrations north across 

 the Gulf of Mexico alight as soon as they reach the coast of the 

 United States. How far they penetrate into the interior before they 

 descend is not known, but the latitude reached probably approxi- 

 mates the northern edge of the Gulf strip of the Austroriparian lil'e 

 zone — that is, slightly north of the latitude of the northern boundary 

 of Florida. More or less strong reasons exist for believing that somie 

 individuals of each of the following species sometimes fly inland befoi'e 

 alighting: 



Black and white warbler {MnioiiUa varia). 

 Nashville warbler {Helminthophila rubricapilla). 

 Yellow warbler {Dendroica srstiva). 

 Magnolia warbler {Dendroica maculosa). 

 Cerulean warbler {Dendroica cerulea). 

 Chestnut-sided warbler Dendroica pensylvanica) . 

 Bay-breasted warbler {Dendroica castanea). 

 Blackburnian warbler {Dendroica blackburnise) . 

 Mourning warbler ( Geothlypis Philadelphia) . 

 Yellow-breasted chat {luteria virens) . 

 Wilson warbler ( Wilsonia pusilla) . 

 Redstart {Setophaga ruticilla). 



OCCASIONAL KOUTES TO OE THKOTJGH CUBA OK YUCATAN. 



Mention should be made of two other possible routes that have not 

 yet been noticed — one from Cuba to Yucatan, the other from Cuba to 

 South America. It is undoubtedly true that certain day-migrants (th.e 

 swallows, for instance) cross between Cuba and Yucatan, but of the 

 night-migrants, such as the warblers, there seems at present no proof 

 that any use this as a regular path of migration. The fact that a com- 

 paratively small number of species of warblers are found as regula.r 

 visitors to both Cuba and Yucatan would create a presumption against 

 this route being much used, while some of the warblers certainly do 

 not follow it. The three following lists make these points clearer. 



SPECIES THAT OCCUR EEQULARLY IN BOTH CUBA AND YUCATAN. 



Black and white warbler {Mhiotilta varia). 

 Parula warbler ( Compsothlypis americana) . 



