KEY TO AMERICAN INSECT GALLS 



19 



Subglobular basal swellings of leaves, length 3 mm on balsam. PI. 7, fig. i. 

 Lintn, '88, p. 60 



Itonid. Balsam gall midge, Cecidomyia balsamicola Lintn. 



Tsuga (hemlock) 



Larvae in Melanophila galleries. Felt 'i3h, p. 214 



Itonid. Hemlock bark midge, Camptomyia tsugae Felt 



Fig. 9. Spruce cone gall, Chermes abietis Linn. Normal 

 type of gall. (Author's illustration) 



Fig. 10. Fir seed 

 midge, D a s y - 

 neura cana- 

 densis Felt. 

 Infested cone. 

 (Origina'') 



Taxodium (bald cypress) 



Irregularly globose, thick-walled, somewhat spongy, modified seeds in cones 

 diameter 5 to 7 mm. Fig. 12. Felt 'i6g, p. 415 



Itonid. Cypress seed midge, R etinodiplosis taxodii Felt 



Fig. II. Janetiella coloraden- 

 s i s. Felt. Deformed needles of 

 P. vi.rginiana. (Original) 



Fig. 12. Cypress seed midge, Re tin o- 

 diplosis taxodii Felt. Deformed cone 

 and seeds. (Original) 



Fusiform twig gall, length 1.25 cm. Felt 'i2f, p. 242 



Itonid. Cypress twig gall, Thecodiplosis ananas si Riley 

 Whitish, fiower-shaped, fungoid gall. Fig. 13. Felt '131, p. 278 



Itonid. Cypress flower gall, Itonida anthici Felt 

 A conical, globular or elongate deformation of the leaf. Felt 'Ilk, p. 556 



Itonid. Cypress leaf gall, Itonida taxodii Felt 



