562 GEOLOGICAL SURVEY OF NEW JERSEY. 



G. Philadelphia, Wils. Mourning Warbler. 



Bright olive; clear yellow below; head ashy; throat aud 

 breast black, the feathers ashy skirted, "as though the bird wore 

 crape." When not in full plumage, both sexes resemble G. agilis, 

 except wing is not longer than tail. 



"Arrives in May, and re-appears in September. Rare. Is 

 similar in its movements to G. trichas, but seems to prefer low 

 bushes and dwarfed trees rather than the ground. Have detected 

 none during the summer. During the spring of 1860, when 

 warblers were unusually abundant, saw several, but have seen 

 few since." [C. C. A.] 



G. trichas, L. Maryland Yellow Throat. Black-masked Ground 



Warbler. 



Olive green ; jet-black mask over forehead, sides of head and 

 neck, bordered behind with clear ash ; under parts yellow, clear 

 on throat and breast ; female without black mask ; with less 

 yellow, and with obscure markings. Length, 4J inches ; tail, 

 '2% inches. 



" Very abundant. This beautiful bird frequents wet, swampy 

 localities, and passes the greater portion of its time upon the 

 ground. In its movements resembles" very much the wren. 

 Builds a nest always upon the ground, raising but a single 

 brood. Sings but little. Have generally all disappeared by 

 September 15th. Like all warblers, is strictly insectivorous, and 

 destroys an incredible quantity during every twenty-four hours." 



ICTERIA, Vieill. 

 I. virens, L. Yellow-breasted Chat. 



Olive green ; throat and breast bright yellow ; belly abruptly 

 white ; lores black ; white line on eyebrow ; tail plain ; tarsus 

 nearly " booted." Length, 7^ inches ; tail, 3 J inches. 



"Very abundant. Arrives early in May, and remains during 

 the summer. Frequents tangled, bushy vegetation, spending a 

 great portion of its time upon the ground. Is sociable, and fre- 

 quently seen in gardens, in town, hopping about gooseberry and 

 currant bushes. Breeds in the haunts above mentioned, raising 

 but one brood. Later in the summer, when the young are fully 

 fledged, retire to the woods and swamps, and sing much less than 

 during incubation. The chat is largely known throughout the 



