OF EASTERN PENNSYLVANIA. 51 



very propitious, and there is an abundance of 

 food-stuffs in consequence, the migration has been 

 delayed until the middle of October. 



Family Sylviidae. Sylvias. 

 The birds constituting this large family are 

 chiefly denizens of the Old World, but sparingly 

 represented in the New. Three subfamilies occur 

 in North America; one of them, Polioptiliuce , 

 peculiar to this country, was formerly associated 

 with the Paridcc, with which it has no special 

 affinity; another, Rcgidincc, is merely warblers with 

 booted tarsi; a third, Syhiintr, constitutes an im- 

 mense assemblage of more than five hundred 

 recorded species. The Syhiiiicc, the typical Old 

 World warblers, is represented in North America 

 by a single Asiatic waif, Kennicott's Sylvia, which 

 was discovered by Dall in our newly acquired 

 territory of Alaska. 



Subfamily Regulinae. Kinglets. 



There are about ten species of the following 

 genus resident in Europe, Asia, and America; two 

 of them are quite abundant in our woods and 

 orchards. 



Regulus calendulas, Licht. 



The Ruby-crowned Kinglet as the above 

 species is popularly designated, is a permanent 

 resident in this latitude. It is an exceedingly 

 active creature, and has been observed by us from 

 early October until the dawn of June. During 



