OF EASTERN PENNSYLVANIA. 377 



the many stomachs which we have examined: 

 Thaneroclerus sanguineus, Cratonychus cinereus, 

 Harpalus compar, Cetonia inda, Chrysomela c&ru- 

 leipennis, Cymindis viridipennis, Selandria roses, &. 

 vitis, Apis mellifi'ca, Formica sanguined, and Aphis 

 mali, A. roses, A. cerasi, and A. avencz, among 

 hemiptera. Later, and especially during the 

 breeding-season, vast numbers of caterpillars of 

 Anisopteryx vernata, A. pometaria, Eufitchia ri- 

 bearia, Cheer odes transversata, Ennomos subsignaria, 

 Hybernia tiliaria, Zerene catenaria, Lithacodes tes- 

 sellaris, Limacodes scapha, Clisiocampa Americana, 

 Orgya leucostigma, Anisota rubiciinda, Lozo- 

 t&nia rosaceana, Eudryas grata, and mature forms 

 of Spilosoma Virginica, Penthina pomonella, Procrs 

 Americana, Lithosia miniata, and many of the 

 Lyccenidce and Torlricid<z. 



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 

 a piece of ploughed 'ground. 



The birds begin to mate from die i5th to the 

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

 or the beginning of June, look about for a suitable 

 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 



