38 



NEW YORK STATE MUSEUM 



Irregular, monothalamous blister leaf gall. Stebb. 'lo, p. 9 



Itonid. Cecidomyia sp. (irregularis Stebb.) 

 Subglobular leaf gall. Felt '158, p. 206 



Itonid. Rhizomyia absobrina Felt 

 Variable, subglobular leaf gall.^ Fig. 41. Felt 'o8e, p. 394 



Itonid. Dicrodiplosis populi Felt 

 Apparently from the same gall, probably predaceous. Felt 'o8e, p. 409 



Itonid. Lestodiplosis globosa Felt 

 Subglobular leaf gall, diameter 3 to 4 mm. Felt 'o8e, p. 400 



Itonid. Mycodiplosis populifolia Felt 

 Roundly conical leaf gall, diameter 3 mm, on P. candicans, balm-of-Gilead. 

 PI. 7, fig- 2. 



Itonid. Cecidomyia sp. 



Fig. 43. Vagabond poplar gall. Pemphigus vagabun- 

 d u s Walsh. (Original) 



Irregular, tumid gall at base of leaf, similar to that ofLasioptera vitis 



Itonid. Cecidomyia sp. 

 Subglobular galls, diameter 6 to 12 mm, occur in June at the base of Cottonwood 

 leaves. Felt '06b, p. 636 



Aphid. Pemphigus populicaulis Fitch 

 Marginal leaf roll, length I cm, predaceous. Felt 'oSe, p. 408 



Itonid. Lestodiplosis populifolia Felt 

 Brown, marginal leaf roll, length 2.5 cm, several larvae in each 



Itonid. Cecidomyia sp. 

 Both edges of the leaf inroUed toward each other, on the upper surface. Chad. 

 '08, p. 138 



Acarid. Eriophyes sp_ 



' There are a series of these globose or conical galls on poplar leaves which are apparently pro- 

 duced by several species of gall midges. 



