OP EASTERN PENNSYLVANIA. 2 1 1 



* 



very low key, so as to be almost ina\idible at a dis- 

 tatite of twenty paces, and which may be re- 

 presented by tze 5 produced with considerable 



uniformity of sound. 



The eggs are slate-color, with a tinge of olive, 

 and marked with'blotches of dark purplish-brown, 

 with penumbree of light purple surrounding the 

 darker spots. The average length is .86 of an 

 inch, and the average breadth .65. In shape' they 

 vary from oblong-oval to nearly rounded forms. 



Family Vireonidae. Vireos and Greenlets. 



This family whi6h was formerly united with the 

 Laniid(B which it resembles in the structure of the 

 bill, has structural peculiarities in the feet by which 

 it may be readily discriminated. The Greenlets 

 are peculiar to America, and embrace five or six 

 genera with nearly seventy recorded, species, one- 

 sixth of them being probably not genuine. The 

 typical genus Vireo embraces thirty species, 

 specially characteristic of N. America, seven oc- 

 curring in the West Indies and Central America, 

 one being exclusively West Indian, and the rest 

 dccupants of South and Central Arr^erica. 



Vireo olivaceus, Vieill. 



The Red-eyed Vireo is one of the most abundant 

 of our breeding species, in Eastern Pennsylvania. 

 It arrives generally during the last week of April, 

 but, occasionally, as late as the second week of 

 May. It is a bold and fearless creature, entering 



