THE AMERICAN MUSEUM JOURNAL 



33. Pine-Cone Oak Gall {Cynips strohilana Osten Sacken). — Consists of 

 many wedge-shaped bodies, closely packed together, with their pointed bases 

 attached to a common center. Hard and corky with a single cell in each. They 

 break off readily when dry. On twigs of swamp white oak {Qiicrcus platanoides). 

 Not common. 



34. Oak Pea Gall {Cynips pisum Fitch). — Globular, green and about the 

 size of a pea, which it resembles in general appearance. Svirface finely netted 

 with fissures or cracks and intervening elevated points. Inside are two cavities 

 divided in the middle by a thin partition. On upper and under sides of leaves 

 of white oak {Quercus alba). 



35. Oak Hedgehog Gall {Acraspis erinacei WalsL). — Rounded or oblong 



104 



