PLATE 3 



Midge galls 



I Vein gall on the under side of Crataegus leaves, L o b o p t - 

 eromyia venae Felt and Dicrodiplosis veni- 

 talis Felt were reared, the latter probably an inquiline. 



1 a Side view of the same 



2 Vein gall on chestnut leaves, adult not reared 



3 Seed pods of D i e rv ilia trifida deformed by As ph on - 



dylia diervillae Felt 



4 Leaf roll on poplar, producer unknown, from which has been 



reared the predaceous Lestodiplosis populifolia 

 Felt 



5 Larger leaf roll on poplar, adult unknown 



6 Reddish, globular leaf gall with slit on under surface on poplar, 



from which the presumably inquiline, R h i z o m y i a 

 absobrina Felt has been reared, true maker unknown 

 6a Upper portion of infested leaf 



7 Enlargement of the petiole of poplar leaf possibly produced 



by the insect which makes the gall figured under A 



8 Cockscomb gall on Crataegus leaves produced by H o r - 



momyia crataegifolia Felt 



9 Larger, globular leaf gall on poplar, adult not reared 

 ga Under side of same 



10 Typical bud gall on D i e r v i 1 1 a trifida produced by 



Asphon dylia diervillae 



11 Globose basal enlargement of poplar leaf, possibly an early 



stage of the reddish, tumid, irregular gall resembling that 

 ofLasioptera vitison grape, producer unknown 



12 Inconspicuous vesicular swellings with a small slit on the 



under surface of poplar leaves, adult unknown 



13 Tumid apical gall on black cherry, Cecidomyia scro- 



ti n a e O. S., adult not reared 

 13a Old gall produced by the above named species 



14 Vein swelling on Crataegus leaves possibly identical with that 



figured under i 



15 Folded edge leaf gall on poplar as seen from above, adult not 



reared 

 15a Appearance of the same gall from below 



16 Cylindric, fimbriate gall on Crataegus from which has been 



reared Winnertzia hudsonici Felt and R h i z - 

 omyia absobrina Felt, the latter at least probably 

 an inquiline 



