OF EASTERN PENNSYLVANIA. I 29 



They are .70 of an inch in length by .55 in 

 breadth. 



Dehdroeca discolor, Baird. 



The Prairie Warbler, a not very abundant 

 species in eastern Pennsylvania, revisits us about 

 the latter part of April or the beginning of May. 

 Although a denizen of open plains and thinly 

 wooded regions, it is far from being shy and sus- 

 picious, and will permit near approaches without 

 manifesting the least timidity. 



In searching for food, they may be seen moving 

 leisurely along the lowermost branches of trees, 

 examining" every leaf and blade of grass for insect- 

 life, uttering at irregular intervals a brief rhirr. 

 Exceedingly active creatures, they resemble the 

 Paridcs, and in being expert Flycatfchers, remind 

 us of the Redstart and the Myiodiodes. 



Coleoptera, diptera, spiders, and caterpillars, 

 contribute mainly to its maintenance. In- the pro- 

 curement of foodj its habits are both arboreal and 

 terrestrial. ChrysOmela ccsruleipennis, Platynus 

 cupripenuis, Donacia mctallica, Cyniindis inridi- 

 pennis, Casnonia pennsylvanica, Haltica chalybea, 

 Cratonyckus periinax; Tabanus lineola, Ctdex 

 tcBfiiorhynchtis, and larvae of Anisopteryx vernata, 

 Clisiocampa Americana, and many of the early 

 Nociuids, with Formica sanguinea. Apis mcllifica, 

 and various aphides, and others, have been found 

 in the many stomachs which we have exajnined. 



Mr. Nuttall speaks of the slender, filing notes 



