KEY TO AMERICAN INSECT GALLS 



29 



Orchidaceae 



Cattleya 



Irregular root galls. Felt '151, p. 89 



Itonid. Orchid root gall, Parallelodiplosis ca tleyae 



Moll. 

 Subspherical or subconical pseudobulbs. Fig. 25. Felt '151, p. 89 



Hym. Orchid Isosoma, Isosoma orchidea um Westw, 



Salicaceae (willows 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 



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) 



Enlarged seeds, reddish brown 



Itonid. Cecidomyia sp. 



Bud galls 



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



Itonid. Cecidomyia p. 

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

 p. 112 



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



