OF EASTERN PENNSYLVANIA. '377 



the many stomachs which we have examined: 

 Thaneroclerus sanguincus, Cr atony chus cinere'iis, 

 Harpalus corn-par, Cetonia inda, Chrysomela c<zru- 

 leipennis, Cymindis viridipennis, Selandria ros<2, S. 

 vitis, Apis mellijica, Formica sanguined, and Aphis 

 mali, A. rosce, A. cerasi, and A. avcncz, among 

 hemiptera. Later, and especially during the 

 breeding-season, vast numbers of caterpillars of 

 Anisoptcryx vernata, A. pomctaria, Eufitchia ri- 

 bearia, Chcerodes transvcrsata, Ennomos subsignaria, 

 Hybernia tiliaria, Zerenc catenaria, Lithacodes tes- 

 sellaris, Li mac odes s cap ha, Clisiocampa Americana, 

 Orgya leucostigma, Anisota rubicunda, Lozo- 

 tcenia rosaccana, Eudryas grata, and mature forms 

 of Spilosoma Virginica, PentJiina pomonella, Procrs 

 Americana, Lithosia miniata, and many of the 

 Lyccenida and Toriricidce. 



The flight of the Baltimore Oriole is somewhat 

 loftier than that of the last described species, but 

 in other respects is analogous. It is strictly arbo- 

 ricole, and in only one instance have we ever 

 discovered that it has any predilection for a ter- 

 restrial life, and then it was observed gleaning on 



t :> r> 



a piece of ploughed ground. 



The birds begin to mate from the i5th to the 

 1 8th of May; and about the last of the same month, 

 or the beo;innino- of June, look about for a suitable 



o o J 



place in which to hang a nest. The nest-materials 

 are mainly collected by the male, while upon the 

 female devolves the duty of weaving the ingre- 

 dients together, which is the labor of a week of 



