KEY TO AMERICAN INSECT GALLS 47 



Possibly reared from the above gall. Felt '156, p. 108 



Itonid. Rhabdophaga hirticornis Felt 

 Reared from several Carya galls, probably inquiline. Felt, '07a, p. 141 



Itonid. Parallelodiplosis caryae Felt 

 Thin-walled, rust-red, hairs long, straight, diameter 2 to 4 mm. PI. 6, fig. 4. 

 Felt 'oge, p. 293 



Itonid. Hickory onion gall, Caryomyia holotricha O. S. 

 Gall similar to the above, the midge probably inquiline. Felt 'o8e, p. 401 



Itonid. Mycodiplosis holotricha Felt 

 Thin-walled, long-haired, melon-shaped, diameter 2 to 3 mm. PI. 6, fig. 8. 

 Felt 'o8e, p. 388 



Itonid. Caryomyia thompsoni Felt 

 Thin-walled, with long, brown hairs, globose, diameter 3 to 4 mm, nipple distinct, 

 long on some. 



Itonid. Caryomyia sp. 



Midrib or vein gall 



A rounded, irregular, pale yellowish, hard swelling, 12 mm long. Osten Sacken 

 '62, p. 193 



Itonid. Caryomyia cynipsea O. S.^ 



Leaf folds and ridges 



Galls either on the main rib or transverse veins, yellowish green, brownish or 

 purplish, two or more confluent, length 6 to 14 mm, diameter 2 to 3 mm. 

 Pergande '04, p. 239 



Aphid. Phylloxera caryae-venae Fitch 

 Globular or irregular, terminating in a toothlike nipple and occurring on tender 

 twigs, petioles or ribs of leaves, often confluent, smooth, diameter 2 to 8 mm. 

 Pergande '04, p. 251 



Aphid. Phylloxera perniciosa Perg. 

 Reniform, petiole or midrib gall, a transverse slit dividing the gall into two 

 halves, diameter 2 to 15 mm. Pergande '04, p. 257 



Aphid. Phylloxera caryaeren Ril 



Occurring on leaf, producing no gall 

 An irregular, yellowish, brown-margined elevation, diameter 3 mm, larva sur- 

 rounded by a viscid secretion. Osten Sacken '62, p. 193 



Itonid. Sticky leaf spot, Caryomyia glutinosa O. S.^ 



Petiole or twig galls 

 Globular or oval, often more or less conical, spiny or smooth, according to the 

 tree on which they grow, and more or less confluent, diameter 5 to 25 mm. 

 Pergande '04, p. 244 



Aphid. Hickory gall aphid. Phylloxera caryaecaulis Fitch 

 Globular, densely cpvered with long, fleshy filaments, diameter 5 to 15 mm. 

 Pergande '04, p. 247 



Aphid. Phylloxera spinuloides Perg., 



' The reference of this species to Caryomyia is provisional, 



