KEY TO AMERICAN INSECT GALLS 



75 



Polythalamous bud galls surrounded by a thick, compact leaf cluster, on Q. 

 lobata. Fullaway 'ii, p. 353 



Cynipid. Andricus wiltzae FuUw. 

 Irregularly rounded or ovate, woody, polythalamous swellings with aborted 

 leaves, on Q. m i n o r . Fig. 85, 8. Beutm. 'loc, p. 120 



Cynipid. Neuroterus obtusilobae Karsch 



b A hard cell in the bud and no circle of modified leaves 

 Rounded or oval, monothalamous, blackish, flower or leaf bud gall, length 2.5 

 mm, diameter 1.25 mm, onQ. prinoides. Fig. 68, 11, 12. Beutm" 

 'iid, p. 358 



Cynipid. Hard oak bud gall, Dryophanta gem u la Bass. 

 Smooth, thin-shelled, globular gall, diameter 2 to 3 mm, arising from a bud and 

 occasionally inclosed by bud scales, on Q. 1 a u r i f o 1 i a . Ashm. '87, 

 ■p. 141 



Cynipid. Andricus calycicola Ashm. 



Fig. 69. Oak 

 rosette gall, Cy- 

 n ips fron dos a 

 Bass. (Original) 



Fig. 70. Neuro- 

 terus niinutus 

 Bass., snowing 



aborted leaves. 



(Original) 



Fig. 71. Neuro- 

 terus minutus 

 Bass., showing several 

 galls on a slightly 

 deformed leaf. (Origi- 

 nal) 



c A soft capsule in the bud and no modified leaves 

 A smooth, reddish brown vesicle in the center of the bud of Q. alba and sur- 

 rounded at the base by bud scales, color pale greenish brown, on Q. alba, 

 Q. bicolor, Q. prinoides, Q. platanoides and Q. mac- 

 rocarpa. Fig. 81, 4-9. Beutm. 'loe, p. 131 



Cynipid. Soft oak bud gall, Neuroterus vesiculus Bass. 

 Reddish vesicles on the terminal growing point of buds and bud scales. Trigger- 

 son '14, p. 4 



Cynipid. Cynips erinacei Mayr.i 



' The better known agamic form is Philonix erinacei Mayr., see p. 94 



