Vol. XXI I"! Cooke, Routes of Bird Migration. I I 



IQ05 J -' *> 



southern or southwestern Alleghenies to Yucatan, it becomes the 

 route probably traversed by the eastern individuals of the Alder 

 Flycatcher {Empidonax trailli alnorum), Least Flycatcher {Em- 

 pidonax minimus), Blackburnian Warbler {Dendroica blackburnia) , 

 Wilson Warbler ( Wilsonia pusilld). 



Along the same general course, it seems probable that the east- 

 ern individuals of the Crested Flycatcher {Myiarchus crinitus) 

 cross from Florida to Honduras ; of the Baltimore Oriole {Icterus 

 galbuld) and the Prothonotary Warbler {Proionotaria citred) from 

 northern Florida to southern Yucatan or Honduras ; of the Ceru- 

 lean Warbler {Dendroica cerulea) from the western slope of the 

 Alleghenies to an unknown destination in Central America ; of 

 the Kentucky Warbler (Geothlypis formosa) from the southern 

 Alleghenies and northern Florida to an unknown district south of 

 the Gulf of Campeche, and of the Mourning Warbler {Geothlypis 

 Philadelphia) from the coast of Louisiana and Texas to the high- 

 lands of Central America. 



So few certain records are known in Central America of the 

 Nighthawk {Chordeiles virginianus) and of the Cliff Swallow 

 {Petrochelidon lunifrons) that only the broad statement can be 

 made that the bulk of these two species cross the Gulf of Mexico, 

 avoiding the West Indies, southern Florida, and Yucatan. 



Almost all of the individuals of the Scarlet Tanager {Piranga 

 ery thro me/as) seem to pass south in a narrow belt between central 

 Cuba on the east and Yucatan on the west. 



It will thus be seen that all of these twenty-two species cross 

 the Gulf of Mexico, the difference arising from the carrying of 

 the eastern edge of the route more or less to the west, and the 

 variations in the length of the flight. 



