288 BULLETIN 19 7, UNITED STATES NATIONAL MUSEUM 



Panama, on both coasts and in the mountainous interior up to an alti- 

 tude of (rarely) 5,000 feet. It is at home in a variety of habitats, 

 ranging from the heavy rain-forest to the low, thorny scrub and cacti 

 of such arid regions as the middle Motagua Valley in Guatemala and 

 the coast of El Salvador. In most parts of its wide and varied winter 

 range it is far from abundant; but on February 1, 1935, I found it 

 rather common in the arid scrub and low, open woodland near Cutuco, 

 on the dry coast of El Salvador. Among the shade trees of the great 

 coffee plantations on the Pacific slope of Guatemala, between 2,500 and 

 3,500 above sea level, I found it present during the winter months in 

 somewhat greater numbers than in most parts of its Central American 

 range — 3^et still far from common. These vireos do not form flocks ; 

 and one almost never sees two together; but individuals may attach 

 themselves loosely to mixed flocks of small birds." 



DISTEIBUTION 



Range. — Southern Canada to Colombia. 



Breeding range. — The yellow-throated vireo breeds north to south- 

 ern Manitoba ( Aweme and Hillside Beach, probably, and Winnipeg) ; 

 southern Ontario (Kenora, possibly, South Magnatawan, Beaumarais, 

 and Ottawa) ; southern Quebec (Pelissier, Montreal, and Hatley) ; 

 and central Maine (Ripogenus, Dover-Foxcroft, and Calais). East to 

 Maine (Calais and Portland) ; the Atlantic Coast States to about 

 central Florida (New Smyrna and Glencoe) . South to Florida (New 

 Smyrna, Oxford, Brooksville, and very rarely to Pensacola) ; southern 

 Mississippi (Pearlington) ; southeastern Louisiana (New Orleans 

 and Thibodaux) ; and central Texas (Houston and Kerrville). West 

 to central Texas (Kerrville and Gainesville) ; eastern Oklahoma 

 (Hartshorne, Tulsa, and Copan) ; eastern Kansas (Winfield, Topeka, 

 and Manhattan) ; eastern Nebraska (Red Cloud and Greeley) ; eastern 

 South Dakota (Yankton and Sioux Falls) ; eastern North Dakota 

 (Hankinson, Fargo, and the Turtle Mountains) ; and southern Mani- 

 toba (Aweme). From the records it appears that within the last 

 generation the yellow-throated vireo has extended its range south- 

 ward or at least has increased in members in the southern part of its 

 breeding range. 



Winter range. — In winter the yellow-throated vireo is found north 

 to southern Veracruz (Tres Zapotes and Santecomapam) ; Yucatan 

 (Chichen-Itza) ; and Quintana Roo (Cozumel Island). East to 

 Quintana Roo (Cozumel Island and Chunyache) ; British Honduras 

 (Toledo district) ; eastern Guatemala (Gualan) ; eastern Nicaragua 

 (Bluefields) ; Costa Rica (Guapiles) ; Panama (Boquete), and Colom- 

 bia (Santa Marta district and Perico). South to Colombia (Perico 



