Migrations of North American Birds. 



273 



A true parallel, however, is seen in the movements of fishes 

 in search of a suitable place to deposit their spawn, which takes 

 place with the same regularity as to date and direction that 

 we find in birds. 



It is only of late years that we have been enabled to deter- 

 mine, even with approximate precision, the winter quarters of 

 our North American birds. Many of the species of the Eastern 

 province are limited by the waters of the Atlantic or Gulf, 

 crowding into Florida, Georgia, and other southern States. Com- 

 paratively few visit the West Indies ; a much larger proportion 

 reach Mexico and Guatemala; and the number of those passing 

 further south diminishes with the latitude. Very few of the 

 land birds pass into South America, the following being a list 

 of the principal species (and their southernmost mentioned 

 limit) recorded as occurring in that portion of the continent, 

 mostly as winter emigrants, although a few are resident. 



Catliartes aura, S. America. 



— atratus. S. America. 

 Falco columbarius, Ecuador. 



— femoralis, S. America. 



— sparverius, S. America. 

 Buteo pennsylvanicus, Ecuador. 

 Asturina uitida, Ecuador. 

 Nauclerus furcatus, Brazil. 

 Rostrliamus sociabilis, Ecuador to 



La Plata. 



Coccyzus erythrophthalmus, Bo- 

 gota. 



Turdus swainsoui, Ecuador. 



Mniotilta varia, Bop-ota. 



Hebninthophaga chrvsoptera, 



Bogota. 

 Siurus noveboracensis, Bogota. 

 Dendroeca blackburnije, Ecuador. 



— cserulea, Bogota. 



— striata, Bogota. 



— aestiva, Bogota. 

 Myiodioctes canadensis, Ecuador. 

 Setopliaga ruticilla, Ecuador. 

 PjTanga rubra, Ecuador. 



— eestiva, Ecuador. 

 Dolichonyx oryzivorus, Gallapagos. 

 Hirundo bicolor, Bolivia. 



Vireo olivaceus, Bogota. 



The following species are recorded as occurring on the 

 Isthmus of Panama and Darien in addition to most of those 

 just mentioned : — 



Antrostomus carolinensis. 

 Ceryle alcyon. 

 Tyrannus carolinensis. 



— dominicensis. 

 Myiarchus crinitus. 

 Empidonax trailli. 



— flaviventris. 

 N.S. VOL. III. 



Dendroeca virens. 



— coronata. 



— castanea. 



— pennsylvanica. 



— maculosa. 

 Mjdodioctes mitratus. 

 Hirundo liorreorum. 



