PLATE 2 



Midge galls 



1 Stem of snapdragon, Impatiens fulva, infested with 



O e c i d i u m i m p a t i e n t i s , the latter inhabited by the 

 larvae of ]\I y c o d i p 1 o s i s i m p a t i e n t i s Felt 



2 The same fungus on leaves 



3 Hazel leaf showing a pilose deformity from which was reared 



Lasiopteryx coryli Felt 



4 Tumid midrib gall on ash from which have been reared 



Contarinia canadensis Felt, D a s }- n e u r a t u m - 

 i d o s a e Felt and which has been erroneously identified as 

 the gall of Cecidomyia pellex O. S. 



5 Blister leaf gall of Asteromyia asterifoliae Beutm. 



on aster leaves 



6 Tumid vein swellings on soft maple from which has been 



reared Dasyneura communis Felt 



7 Petiole gall on V i t i s b i c o 1 o r , producing S c h i z o m y i a 



p e t i o 1 i c o 1 a Felt 



8 Upper surface of Linden leaf showing discoloration produced 



by the reddish galls of Cecidomyia verrucicola 

 O. S., adylt unknown 

 8a Under surface showing the size and globular character of the 

 galls in a highly colored condition. Compare with plate 4, 

 figures 5 and 6 



9 Reddish swellings on under surface of hornbeam (Carpinus) 



leaves produced by Cecidomyia pudibunda O. S., 

 adult unknown 



10 Green bud gall on Corn us stolonifera, adult un- 



known 



1 1 Discolored leaf mine inhabited byLasioptera excavata 



Felt 

 iia Under surface of infested leaves 



12 Swollen fruit of wild cherry, P r u n u s v i r g i n i a n a , from 



which has been reared Contarinia virginianiae 

 Felt, Parallelodiplosis acerneae Felt, 1 1 n i d a 

 canadensis Felt, Arthrocnodax apiphila Felt, 

 Rhizomyia absobrina Felt and a species of Lesto- 

 diplosis, the last is predaceous and the two preceding at 

 least, probably inquilines 



13 Leaves of Virginia creeper or woodbine with the midrib de- 



formities produced by Dasyneura parthenocissi 

 Stebb. 



14 Petiole gah on fox grape, Vitis labrusca, produced by 



Schizcmyia petiolicola Felt 



218 



