KEY TO AMERICAN INSECT GALLS 49 



Swellings in husks 

 Irregular swellings in the husks, produced by pale reddish larvae. Osten Sacken 

 '70, p. 53 



Itonid. Hickory husk midge, C a r y o m y i a n u c i c o 1 a O. S.i 



Betulaceae (birch family) 

 Corylus (hazelnut) 

 Globose, constricted twig swellings, diameter 1.5 cm. 



Coleop. Bronze birch borer. Agrilus politus Say 

 Sterile catkins deformed, swollen basally. PI. 7, fig. 3. Stebb. '10, p. 16 



Itonid. Hazel catkin gall. Cecidomyia squamulicola 



Stebb. 

 Slightly swollen, aborted buds, length 4 mm, diameter 3mm. Fig. 48 



Itonid. Hazel bud gall. Cecidomyia sp. ai737 

 Bud deformation checking further development as soon as it has begun to expand. 

 PI. 15, fig. 5. Chad. '08, p. 131 



Acarid. Eriophyes sp. 

 Red-haired, leaf fold. Felt 'i5e, p. 193 



Itonid. Red plush gall. Lasiopteryx coryli Felt 

 Reared from same gall. Felt '07a, p. 128 



Itonid. Mycodiplosis corylifolia Felt 



Ostrya (hop hornbeam) 

 Terminal folded leaves 



Itonid. Cecidomyia sp. 

 Globose, red-tinted pocket gall, diameter 1-2 mm. Wells '14, p. 293 



Acarid. Eriophyes sp. 

 Carpinus (hornbeam, ironwood) 

 Reddish leaf fold along lateral veins. Osten Sacken '62, p. 202 



Itonid. Hornbeam leaf fold, Cecidomyia pudibunda O. S. 



Betula (birch) 

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



Itonid. Miastor americana Felt 

 From bark of black birch injured by a Sesian 



Itonid. Mycodiplosis corylifolia Felt 

 Under decaying bark. Felt 'i2f, p. 246 



Itonid. Itonida putrida Felt 

 Under decaying bark, presumably predaceous 



Itonid. Lestodiplosis sp. 

 Crowded, irregular bud deformation, often in large bunches, on B. 1 u t e a. 

 Incipient " witches broom " ? PI. 15, fig. 2. Chad. '08, p. 128 



Acarid. Eriophyes sp. 

 Irregular twig and branch annulations. Felt '06, p. 287 



Coleop. Bronze birch borer, Agrilus anxius Lee. 

 Reared from seeds. Lintn. '96, p. 162 



Itonid. Birch seed midge, Oligotrophus betulae Winn. 



' Gineric reference is provisional. 



