20 INSECT-GALLS OF THE VICINITY OF NEW YORK CITY 



shell. Yellow, tinged with red in summer; brown in winter. Grows singly 

 or in clvistcrs of two or three on terminal twigs of white oak (Qitcrcus alba). 

 Common. 



38. Pointed Bullet Gall {Holcaspis diiricaria Bass.). — Globular, with a 

 short point at the apex. Hard and woody, with a small cavity in the center 

 containing a small oval, whitish shell in which the larva lives. Yellow and 

 tinged with red in summer; brown in winter. On terminal twigs of swamp 

 white oak {Qiterciis platanoides) growing singly or in clusters of two or more. 

 Common. 



39 Polished Oak Gall {Dryophania polita Bass ) — Globular, smooth, with 

 a thin outer shell Inside is a single round cell held in position by radiating 

 libers. Pale green, sometimes tinged with red, and about i to J in. in diameter. 

 On both surfaces of the leaves, at or near the summit of young and thrifty 

 shoots, of post oak {Quercus minor). Grows singly or in clusters. August and 

 September. Not rare in the pine barrens of New Jersey. 



