INSECT-GALLS OF THE VICINITY OF NEW YORK CITY 17 



30. Oak Capsule Gall {Andriciis capsidiis Bass.). — Oval and attached to a 

 pedicel, ^ to J in. long. Resembles the capsule of certain mosses. On the 

 margin of leaf of swamp white oak {Quercus platanoides). Not common. 



3 1 . Oak Midrib Gall (-4 ndricits pigcr Bass. ) . — A large, irregular woody swell- 

 ing on the midrib of leaf of black oak {Quercus veliitina), always on the under 

 side and usually on the lower half of the leaf. Upper side indicated by a 

 widening of the midrib and a slight depression of the leaf at that point. Rather 

 common. 



32. Spiny Oak Gall {Cynips prinoidcs Beuten.). — Globular, covered with 

 ntimerous cone-like projections, hard and woody, with a small cell inside. 

 About ^' in. in diameter. Green, tinged with red. On upper side of leaf 

 of dwarf chestnut oak {Quercus prinoides). Not common. 



