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 ni 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. PNeuroterus 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. FuUaway '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. 



"t^^^ 



X4 



Fig. 102. Oak spangles, Cecidomyia 

 poculum O. S., on Q. muhlenbergiae. 

 One gall shown in section. (Original) 



Fig. 103. Oak spangles, 

 Cecidomyia pocu- 

 lum 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. Fullavvay '11, p. 352 



Cynipid. Andricus pattersonae F uUw 



