INSESSORES: SYLVICOLID^E. 175 



The female is without the black band. This Warbler 

 builds its nest upon the ground, and lays four to six 

 white eggs speckled with light brown. 



The Gray-headed Warbler, G. vclatus, Cab., of the 

 West Indies, and perhaps found in the United States, 

 is four and three fourths inches long, and distinguished 

 from the preceding by a narrower black frontal band, 

 and by the dark ash of the crown. 



The Mourning Warbler, G. Philadelphia, Baird, of East- 

 ern North America, is five and a half inches long, the 

 wing less than two and a half inches ; and distinguished 

 by the ashy gray of the head and neck, and the black 

 patch on the fore part of the breast. 



Macgillivray's Warbler, G. Macgillivrayi, Baird, of 

 Western North America, is five inches long, the wing 

 less than two and a half inches, the head and neck ash, 

 a narrow frontlet and space around the eye black, the 

 feathers of the forward under parts really black, but 

 appearing gray from the ashy tips of the feathers ; the 

 rest of the upper parts dark olive -green, and of the lower, 

 yellow. 



The Genus Oporornis has the bill rather compressed, 

 wings elongated, tail slightly rounded, tarsi elongated, 

 and claws large ; above olive green beneath yellow. 



The Connecticut Warbler, 0. agilis, Baird, of the 

 Eastern United States, very rare, is six inches long, 

 the wing three inches. 



The Kentucky Warbler, O. formosns, Baird, of the 

 Eastern United States, is five inches long, the wing 

 less than three ; and distinguished by the yellow throat 

 and superciliary stripe, and by the top of the head 

 and streak beneath the eye, which are black. 



The Genus Ictcria comprises the Chats. 



The Yellow-breasted Chat, /. viridis, Bonap., of the 

 United States east of the Missouri, is nearly seven and 



