KEY TO AMERICAN INSECT GALLS 



29 



Orchidaceae 



Cattleya 



Irregular root galh. Felt '151, p. 89 



Itonid. Orchid root gall, Parallelodiplosis ca tleyae 



Moll. 

 Subspherical or subconical pseudobulbs. Fig. 25. Felt 'i5i, p. 89 



Hvm. Orchid Isosoma, Isosoma orchid e a um Westw. 



Salicaceae (willow.s and poplars) 



Salix (willow) 

 Key to willow galls 



Fruit galls, p. 29 



Bud galls, p. 29 



Rosette galls, p. 30 



Leaf galls, p. 32 



Leaf rolls or folds, p. 32 

 Capsule or pocket galls, p. 32 

 Turgid leaf galls, p. 33 



Twig galls, p. 34 



Fig. 26. Beaked willow gall, 

 Phytophaga rigidae 



O. S. Typical gall. (Author's 

 illustration) 



Fruit galls 



Enlarged seeds, reddish brown 





^. 



Fig. 27. Pine cone 

 gall, R h a b d o - 

 phaga strobi- 

 le i d e s Walsh. 

 Typical gall. _ (Au- 

 thor's illustration) 



Itonid. Cecidomyia sp. 



Bud galls 

 Apical willow buds blasted. PI. 12, fig. 3 



Itonid. Cecidomyia p. 

 Apical, fusiforrh, beaked gall, length 2 cm. Fig. 26, pi. 11, fig. 5. Felt '06a, 

 p. 112 



Itonid. Beaked willow gall, Phytophaga rigidae O. S. 



