OF EASTERN PENNSYLVANIA. 147 



The eggs are four in number, flesh-colored and 

 marked with a sprinkling of dark-red at the larger 

 end. 



Oporornis agilis, Baird. 



The history of this extremely rare and beautiful 

 species, the Connecticut Warbler, is involved in 

 considerable obscurity. Nowhere very abundant, 

 solitary individuals have been observed by us in 

 Delaware Co., Pa. Just beyond the limits of Phila- 

 delphia. Its appearance occurs between the ist 

 and loth of May; and by the loth or 2Oth of the 

 month, it resumes its journey for more northern 

 climes. All that we have noticed at this time 

 were males, which fact conducts to the inference 

 either that females retire from their southern 

 homes subsequently to the former or at the same 

 time, and either go directly to their breeding- 

 quarters, or being more retired, seek the coverts 

 of dense thickets. 



The males do not appear shy, judging from their 

 behavior. They delight to visit the trees along 

 streams of water, and show a decided predilection 

 for the common Salix hicida, doubtless, on account 

 of the ready supply of insects which it finds among 

 its leaves and branches. 



Its movements are extremely agile, \vhich its 

 specific name would seem to imply. It has all the 

 address of the Paridtz, and in the skill with which 

 it captures an insect upon the wing, it almost 

 rivals the Muscicapidce, It is unquestionably true 



