KEY TO AMERICAN INSECT GALLS 



123 



Bud-shaped, polythalamous twig gall without an opening. Fig. 117. Pack. 

 '90, p. 615 



Hemip. Hackberry bud gall, Pachypsylla gemma Ril. 



Fig. I ig. Hop stem gall, Lasioptera humulicaulis Felt. 

 (Author's illustration) 



Conical, spine-shaped leaf gall on the under surface and arising from a circular, 

 yellowish base, height 4 mm, diameter 2.8 mm. Pack. '90, p. 614 



Itonid. Spiny hackberry gall, Cecidomyia spiniformis 



Patt. 



