NORTH AMKKICAN IIYMENOPTERA. 131 



tt- — Oblong, ovate galls in clusters and ribbed like a melon ; 

 raonothalamous. 

 Divided lengthwise into partitions . Andricus formosus 

 Bass. (Q. rubra, Q. ilicifolia) ; A. capsualm Ashm. 

 (Q. cinerea, Q. catesbeei). 

 Without partitions, jumping . Andricus scdtatus Ashm. 

 (Q. catesbiei, Q. cinerea). 

 ttt- — Galls in the buds . Andricus calycicola Ashm. (Q. 

 laurifolia) ; Neuroterusf vesicula Bass. (Q. alba) ; N. 

 afflnis Bass. (Q. prinoides} ; N. minutus Bass. (Q. 

 alba) ; Dryophanta gemula Bass. (Q. prinoides). 

 Suppositious bud gall . Holcaspis f corrugis Bass. ( Q. 

 prinoides). 

 tttt- — Lfiiify hud galls ; clusters of small, narrow, deformed 

 leaflets, issuing from a bud axil and surrounding 

 one or more kernels, 

 a. — Monothalamous. 



Gall very large ; kernel smooth . Andricus frondosa 



Bass. (Q. alba). 

 Galls very large ; kernel rugose . Andrieus foliatiis 



Ashm. (Q. virens). 

 Gall small, kernel smooth . Andricus stropus Ashm. 

 (Q. obtusiloba) ; A. cinnamomeus Ashm. (Q. parvi- 

 folia). 

 aa.— Polythalamous ; kernels very small, smooth . An- 

 dricus topiarius Ashm. (Q. obtusiloba). 

 e. — Galls on the blossoms. 



Small, globular, wooly gall, containing numerous seed-like 

 kernels . Andricus Turnerii Ashm. (Q. aquatica). 

 A minute, seed-like kernel occurring singly on aments . An- 

 dricus hlasiophagus Ashm. (Q. cinerea) ; Dryophanta 

 gemula Bass. (Q. prinoides). 

 d. — Wooly galls ; globular or irregular, containing numerous 

 seed-like kernels inside . Callirkyiis seviinator 

 Harris (Q. alba, Q. bicolor, Q. [)riiuis) ; C. operator 

 0. S. (Q. nigra, Q. ilicifolia, Q. palustris). 

 E. — Fig galls ; irregular and hard, or soft, thin shelled, bladder- 

 like galls crowded together around a limb, so press- 

 ing and crowding upon each other as to resemble 

 pressed figs. 



