KEY TO AMERICAN INSECT GALLS II5 



(d) Cells small and Ijonded together by a hard substance 



Hemispherical, hard, polythalamous leaf gall covered with pale yellowish wool* 

 more or less ringed with ferruginous, stem entirely rust-red, resembles A- 

 f 1 o c c u s, diameter 5 to 9 mm, occurs on both surfaces of Q. c h r y s o- 

 1 e p i s. Ashm. '97, p. 132 



Cynipid. Callirhytis lasius Ashm. 

 Densely haired, russet-colored, hemispherical masses attached by a small point 

 to the upper surface of the leaf, diameter 12 to 18 mm, on Q u e r c u s sp. 

 Bassett '81, p. 92 



Cynipid. Bassettia tenuicornis Bass. 



(c) Polythalamous, und«r wool 



Woolly, rusty, yellowish brown, polythalamous midvein gall, dimensions 2 by 

 3 cm on Q. ? c r a s s i f o 1 i a. Bassett '90, p. 78 



Cynipid. Andricus mexicanus Bass. 



(/) Monothalamous, large 

 Irregular, lemon-shaped, monothalamous oak apple, length 8 to 10 mm, diameter 

 5 to 7 mm, thickly covered with whitish, fulvous hairs. Fig. 109. Cal. 

 Trotter '11, p. 115 



Cynipid. ? Callirhytis flocculenta Tr-ott. 



(17) Galls on pedicels attached to the leaves 



Elongate or fusiform, pointed leaf or twig gall, usually with a long pedicel, the 



prolongation of a leaf vein, pale green, thin-shelled and with an oblong, thin 



larval cell supported by radiating fibers, length 20 to 25 mm, diameter 4 to 8 



mm, on Q. coccinea and Q. rubra. Fig. 92, 8-10. Beutm. '09b, 



P- 56 



Cynipid. Oak spindle gall, Amphibolips coelebs O. S. 

 Elongate, fusiform, stemmed leaf gall mostly on the margin, sometimes on the 

 surface, length of stems 5 mm, of the fusiform gall 3 to 4 mm, on Q. alb a. 

 Osten Sacken '61, p. 61 



Cynipid. Small oak spindle gall, Andricus f u s i f o r m i s O. S. 

 Slender, globe-shaped, leaf galls nearly i> mm long, the stalk twice as long 

 as the swelling, the surface pubescent, onQ. prinoides Fitch '51, 

 p. 820 



Cynipid. Andricus chinquapin Fitch 

 Monothalamous, marginal, stemmed leaf gall, length of stem 12 to 18 mm, 

 length of gall 10 mm, diameter of gall 3 mm, on Q. b i c o 1 o r. Fig. no, 

 Bassett '81, p. loi 



Cynipid. Oak capsule gall, Andricus capsulus Bass. 

 Fusiform, stemmed, green or dark olive-brown leaf gall with a free cell within, 

 length 4 to 5 mm, diameter 2.5 to 3 mm, on Q. rubra and Q. c o c c i n e a. 

 Fig- 99. ^. 9- Beutm. 'iid, p. 366 



Cynipid. Dryophanta pedunculata Bass. 

 Fusiform, pedunculate, smooth, reddish brown vein gall, length 8 to 10 mm, 

 the stem slender, smooth, length mm. Cal. Trotter '11, p. 105 



Cynipid. Andricus pseudo-callidoma Trott. 



