INSECT-GALLS OF THE VICINITY OF NEW YORK CITY ii 



15. Empty Oak Apple {Amphibolips inanis Osten Sacken). — Shape like the 

 preceding, but considerably smaller. Almost empty, the larval cell being 

 kept in position by radiating filaments. Green and soft when young; brown 

 and brittle when dry. On leaves of scarlet {Quercus coccinea) and red oak (Q. 

 rubra). 



16. Scrub Oak Gall (Amphibolips ilicifolicB Bass.). — Elongated, fusiform, 

 tapering at both ends, with the apex long and more slender than the base. 

 Length about i^ in. ; width about f inch. Within is an elongated kernel held 

 in position by radiating fibers. Green and soft in summer; brown and brittle 

 in winter. On the leaves and petioles of dwarf oak {Quercus nana). Not 

 common. 



