KEY TO AMERICAN INSECT GALLS 



107 



Ovate-acuminate, blisterlike galls on the points of the acute lobes of the leaf, 

 each with a long, hairlike point, onQ. coccinea. Bassett '90, p. 74 



Cynipid. Leaf-lobe blister gall, Callirhytis pusulatoides 



Bass. 



Fig. 100. Oak button gall, Neuro- 

 terus umbilicatus Bass. One 

 gall shown in section. (Original) 



Fig. loi. Oak spangles, Cecidomyia 

 p o c u 1 u m O. S., on Q. alba. One gall 

 shown in section. (Original) 



Ellipsoidal, very small, monothalamous, yellowish, minutely pubescent leaf 

 gall occurring on either surface, diameter i mm, on opposite side of leaf a 

 yellowish spot with a diameter of i to 2 mm. Cal. Trotter '11, p. 119 



Cynipid. ?Neuroterus perpusillus Trott. 

 Rounded, flattened, disklike, monothalamous leaf galls, pinkish or purplish 

 apically, sometimes yellowish, diameter 3 to 4 mm, height i mm, on white 

 oak. Fullaway '11, p. 334 



Cynipid. Biorhiza californica Beutm. 



Small, circular, flattened, brown, monothalamous leaf galls, concave and with 



a minute, conical elevation centrally, diameter i to 1.5 mm, in greatest 



numbers on the under surface of the leaf, on Q. p 1 a t a n o i d e s. Fig. 



85, 7, 100. Beutm. 'loc, p. 124 



Cynipid. Oak button gall, Neuroterus umbilicatus Bass. 



Fig. 102. Oak spangles, Cecidomyia 

 pocuium O. S., on Q. muhlenbergiae. 

 One gall shown in section. (Original) 



Fig. 103. Oak spangles, 

 Cecidomyia pocu- 

 ium O. S., on Q. macro- 

 c a r p a. Side view and 

 section of gall. (Original) 



Disk-shaped, often flat, greenish leaf galls with a lilac center, the margin 

 irregular, diameter 6 mm, on Q. d o u g 1 a s i i. Fullaway '11, p. 352 



Cynipid. Andricus pattersonae F ullw 



