KEY TO AMERICAN INSECT GALLS 



33 



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



Acarid. E r i o p h y e s a c n i g rn a 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 ni i 1 i s . PI. 3, fig. 8. Walsh '66, p. 257 



Hym. P o n t a n i a d e s m o d i o i d c s Walsh 

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



P- 354 



Itonid. Willow blister gall, (J 1 i g o t r o p h u s s a 1 i c i f o 1 i u s 



Felt 



Fig. 34. R h a b d o - 

 phaga caulicola 

 Felt. Infested stems, 

 two sectioned. (Origi- 

 nal) 



Fig. 35. Sa ck - 

 enoniyia Pack- 

 ard i Felt. In- 

 fested twig and 

 another in section 

 showing character- 

 istic galleries. (Origi- 

 nal) 



Fig. 36_ 

 Sackeno" 

 my ia p o r" 

 t e r a e Ckll' 

 Infested twig- 

 (Original) 



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

 6. Walsh '64, p. 606 



Itonid. Willow lipped gall, Hormomyia verruca Walsh 

 Apparently 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. 



