KEY TO AMERICAN INSECT GALLS 53 



Golden, rusty or dark brown erineum on the under leaf surface of F. a m e r- 

 icana. Chad. '08, p. 132 



Acarid. Eriophyes sp. 

 A whitis'h or golden yellow to brown erineum on the upper leaf surface between 

 or following the veins. PI. 15, fig. 7. Chad. '08, p. 133 



Acarid. Eriophyes sp. 

 A frosty white erineum in large patches on the under leaf surface of F. s y 1- 

 vatica. Chad. '08, p. 133 



Acarid. Eriophyes sp. 

 Castanea (chestnut) 



Under decaying bark. Felt '13m, p. 205 



, Itonid. Miastor americana Felt 



Under decaying bark. Felt '151, p. 140 



Itonid. Winnertzia pectinata Felt 

 Under decaying bark. Felt 'i ik, p. 557 



Itonid. Itonida pugionis Felt 

 Under decaying bark. Felt '151, p. 220 



Itonid. Janetiella ligni Felt 

 Petiole or terminal bud gall. Fig. 51. Felt 'oge, p. 229 



Itonid. Chestnut bud gall, Rhopalomyia castaneae Felt 



Fusiform, ribbed, greenish or brown mid or lateral vein swelling, length 7 to 15 

 mm, diameter 3 to 5 mm. Fig. 52. 



Itonid. Cecidomyia sp. 

 Globose or hemispherical capsule leaf gall, diameter 2 to 3 mm. Chadwick, '08, 

 p. 130 



Acarid. Eriophyes sp. 

 Galls encircling yoitng twigs and resembling in size and shape egg masses of the 

 forest tent caterpillar. Braun '17, p. 198 



Lepid. Ectoedemia castaneae Busck. 

 Irregular swelling of the burr of C. p u m i 1 a 



Itonid. Cecidomyia chinquapin Beutm. 

 Irregular swelling of the base of the petiole, dimensions approximately 7 by 

 10 mm, on C. p u m i 1 a 



Itonid. Cecidomyia sp. 



Castanopsis sp. (Western Chinquapin) 

 Globular, brown, thin-shelled blossom galls, internally soft, pithy, diameter 

 12 to 24 mm. Beutm. '17, p. 345 



Cynipid. Andricus castanopsidis Beutm. 



Quercus (oak) 



Key to oak galls 



1 Root galls, p. 54 



2 Gall insects reared from decaying bark or wood, p. 54 



3 Galls of branches and twigs, the deformations not separable from the plant (compar 



with 4, p. 62), p. 54 



4 Galls attached to branches and twigs but more or less separated from the normal plant 



tissues [compare with 3, p. 54 and also with oak apples (lo), p. 95], P- 62 



5 Gall consisting of one or more larval cells or capsules in a leaf bud, p. 74 



6 Galls of the leaves (in some cases a leaf itself is aborted and the gall issues from the 



twig or bud), p. 78 



7 Galls of the aments or catkins, p. 116 



8 Galls of the fniits, p. 117 



