KEY to AMERICAN liSTSECt GALLS 



33 



Filamentous structures on leaf. Walsh '66, p. 227 



Acarid. Eriophyes aenigma Walsh 



Turgid leaf galls 

 Smooth, flattish, fleshy, sessile, yellowish green, on both surfaces of the leaf, 

 length 6 to 12 mm, on S. h u m i 1 i s . PI. 3, fig. 8. Walsh '66, p. 257 



Hym. Pontania desmodioides Walsh 

 Yellowish, red-spotted, flattened gall, diameter 2 to 3 mm. Fig. 31. Felt 'lod, 



P-354 



Itonid. Willow blister gall, Oligotrophus salicifolius 



Felt 



Fig. 34. R h a b d o - 

 phaga caulicola 

 Felt. Infested stems, 

 two sectioned. (Origi- 

 nal) 



Fig. 35. S a c k - 

 enomyia Pack- 

 ard i Felt. In- 

 fested twig and 

 another in section 

 showing character- 

 istic galleries. (Origi- 

 nal) 



Subconical, truncate, greenish yellow, lipped gall, diameter 2 mm. PI. 10, fig- 

 6. Walsh '64, p. 606 



Itonid. Willow lipped gall, Hormomyia verruca Walsh 

 Apparetitly reared from the same gall. Felt '07a, p. 108 



Itonid. Clinorhyncha filicis Felt 

 Conical, monothalamous, petiole gall, length 6 to 9 mm, diameter 3 to 4 mm. 

 Rohw. '15, p. 213 



Hym. Euura cosensii Rohw. 

 Ovate, fleshy, reddish, willow leaf galls in parallel rows on either side of the midrib, 

 brownish red, beneath white, tinged with purple, length 7 to 10 mm, on S. 

 f r a g i 1 i s . Felt '06b, p. 638 



Hym. Pontania hyalina Nort. 



