42 BLACK-THROATED GREEN WOOD-WARBLER. 



quills edged with brownish-white, the two outer tail-feathers with a white 

 patch on the inner web; the lower parts dull white, tinged on the neck with 

 yellow, on the sides with greyish-brown. 



Male, 51 8£. 



Middle districts. Rather common. Migratory. 



The Dwarf Maple. 



Acer spicatum. 



This is a low shrubby tree, which does not attain a greater height at most 

 than fifteen or twenty feet. It abounds along the rocky margins of creeks or 

 rivers, especially those meandering at the bases of the Alleghany mountains. 



BLACK-THROATED GREEN WOOD- WARBLER. 



'^Sylvicola virens, Lath. 



PLATE LXXXIV Male and Female. 



I have traced this species from the Texas to Newfoundland, although at 

 considerable intervals, along our Atlantic coasts, it being of rare occurrence 

 or wanting in some parts, while in others it is abundant; but in no portion of 

 the United States have I met with it so plentiful as around Eastport in 

 Maine, where I saw it in the month of May. Many remain all summer in 

 that Slati". as well as in Massachusetts, and tbe northern parts of New York; 

 and some are found at that season even in the higher portions of Pennsylva- 

 nia. On the coast of Labrador it was not observed by me or any of my par- 

 ty, and it is not mentioned by Dr. Richardson as having been seen in the 

 Fur Countries. Its habits are intermediate between those of many of our 

 Warblers and the Vireos, the notes of which latter it in a great measure as- 

 sumes. It usually makes its appearance in Maryland and New Jersey about 

 the first week of May, when it is observed to be actively engaged in search- 

 ing for food, regardless as it were of the presence of man. Its movements 

 when proceeding northward are rapid, and it advances through the woods 

 solitarily or nearly so, it being seldom that more than two or three are found 

 together at this time, or indeed during the breeding season, at which period 

 each pair appropriates to itself a certain extent of ground. Its retrograde 



