284 BIRDS OF PENNSYLVANIA. 



way, * writing- of this species, very aptly says, " it is one of the most 

 agile of its tribe, its quick and restless movements being more like 

 those of the Eedstart than those of its nearest kindred." Food consists 

 largely of various small winged insects ; plant-lice, ants and spiders are 

 also fed upon to a considerable extent. 



Dendroica caerulea (Wiis.). 



Cerulean Warbler 



DESCRIPTION. 



Length 4| to 5 ; extent about 8 inches. 



Male, in spring. Above bright blue, streaked with black ; the crown somewhat 

 brighter and darkest ; below white; the breast and sides with blue or bluish-black 

 streaks ; two white wing bars ; tail-feathers, except central pair, with white patches 

 on inner webs, near the end. 



" Female. Greenish-blue above, brightest on the crown ; beneath white, tinged 

 with greenish-yellow, obsoletely streaked on the sides ; eyelids and a superciliary 

 line greenish-white." (Hist. N. Am. ..) 



Habitat. Eastern United States and southern Canada to the plains. Rare or . 

 casual east of central New York and the Alleghanies. Cuba (rare) and Central 

 America in winter. 



The Cerulean or Blue Warbler I have found in eastern Pennsylvania 

 only as a very rare spring and fall migrant. During the last ten years 

 I have seen but five of these birds, one was observed in an apple orchard 

 in May, the others were all seen in the tops of tall forest trees. In the 

 western counties of the state this species is reported to be tolerably 

 frequent during migrations, and Dr. Yan Fleet says it breeds in Clinton 

 county ; and in Somerset county Dr. H. D. Moore has noted it as a rare 

 summer visitor. The viscera of two individuals which I have examined 

 contained spiders and small beetles, etc. ; the stomach of one bird was 

 destitute of all food except portions of a wasp-like insect. 



Dendroica pensylvanicaf (Lmu.). 



Chestnut-sided Warbler. 



DESCRIPTION (Plate 73, Fig. <?, Male}. 



Length about 5 ; extent about 7| inches. 



Male, in sp ring. Above greenish-olive and pale bluish-gray (the latter especially 

 on back of neck) streaked with black ; top of head yellow, with black border (in 

 some specimens feathers of forehead and those above the black lores and eyes are 

 whitish) ; broad triangular patch below eye from base of mandible black, and from 

 this a narrow black line joins the showy chestnut stripe which extends back along 

 sides to flanks ; ear-coverts and portion of sides of neck, and rest of under parts pure 

 white, two yellowish wing-bands ; three outer pairs of tail-feathers white on inner 

 webs towards end. 



* Ornithology of Illinois. Ridyw. 



tThe bill in this species, and also in D. castanea. is broader, and the bristles are longer than in others 

 of the genus. 



