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. 10. Fir seed 

 midge, D a s y - 

 neura cana- 

 densis Felt. 

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

 type of gall. (Author's illustration) "^ 



(Origina'l 



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. virginiana. (Original) 



Fig. 12. Cypress seed midge, Retino- 

 diplosis taxodii Felt. Deformed cone 

 and seeds. (Original) 



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



Itonid. Cypress twig gall, Thecodiplosis ananassi Riley 

 Whitish, flower-shaped, fungoid gall. Fig. 13. Felt '13!, 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 



