KEY TO AMERICAN INSECT GALLS Ol 



Rounded or elongate midrib swellings filled with oblong or elongate kernels, a 

 few to 40; when young concealed in the tissues and bursting open in October, 

 onQ. rubra, Q. velutina. Beutm. 'i3g, p. 131 



Cynipid. Deciduous oak gall, Andricus decidua Beutm. 



Irregularly rounded, oval or elongate, midrib or vein gall, sometimes deforming 



the entire leaf, green, turning brown and becoming woody when old, length 



10 to 35 mm, diameter 10 to 15 mm, on Q. garryana. Beutm. '13d, 



p. 280 



Cynipid. Neuroterus washi'ngtonensis Beutm. 

 Fusiform ribbed or carinate mid or lateral vein folds on the under surface, length 

 6 to 8 mm, diameter 3 to 4 mm. Fig. 73, 74. 



Itonid. Cecidomyia sp. a22g6 

 Elongate, polythalamous, midrib swellings with the larval cells perpendicular to 

 the surface of the leaf, length 18 mm, diameter 9 mm, onQ. Pundulata. 

 Beutm. '10, p. 134 



Cynipid. Neuroterus quercicola Dalla Torre 



(2) Less abrupt and localized enlargements of midveins (more rarely of lateral veins and the 



petiole) 



Midrib, polythalamous swellings mostly near the base of the leaf, some on the 

 petiole, onQ. tinctoria. Fig. 75, 76. Osten Sacken '65, p. 356 



Cynipid. Midrib tumor gall, Callirhytis tumifica O. S. 

 Irregular, elongate or globose enlargements of the midrib or terminal twigs, 

 length 1.5 to 2.5 mm, diameter 4 to 12 mm, onQ. nigra, Q. rubra, 

 Q. lobata. FuUaway '11, p. 362 



Cynipid. Callirhytis nigrae O. S. 

 Irregular, polythalamous, midrib swellings often 2.5 cm long, 1.2 cm in diameter, 

 onQ. tinctoria. Bassett '81, p. 105 



Cynipid. Oak midrib gall, Andricus piger Bass. 



Slight, fleshy swelling along the midrib, containing two or more small cells, 



diameter of latter 1.8 to 2 mm, on Q. laurifolia. Ashm. '87, p. 141 



Cynipid. Callirhytis cellae Ashm. 



Hard, woody, midvein or lateral vein galls, the leaf much wrinkled and deformed, 



length 18 mm, diameter 6 mm, onQ. macrocarpa. Beutm. 'loc, p. 135 



Cynipid. Neuroterus flavipes Gill. 

 Irregular, pustulelike, polythalamous petiole and midrib gall on Q. minor. 

 Beutm. 'loc, p. 133 



Cynipid. Neuroterus gillettei Bass. 

 Subglobose, slightly depressed, monothalamous, smooth and, under the lens, 

 squamose, grayish red vein gall, diameter 5 to 6 mm, height 3 to 3.5 mm. 

 Mex. Trotter '11, p. 126 



Cynipid. ? C y n i p s sp. 

 Spherical, monothalamous, smooth, with a slight, superficial roughness, reddish 

 vein gall, occurs singly or in clusters and when in the latter, somewhat com- 

 pressed, diameter 5 to 6 mm. Mex. Trotter '11, p. 123 



Cynipid. C y n i p s sp. 

 Spherical, monothalamous, woody vein gall, the surface smooth, grayish, with 

 minute, grayish warts, diameter 8 mm. Cal. Trotter '11, p. 118 



Cynipid. ? C y n i p s sp . 



