October, '11] FELT: GALL MIDGE HOSTS 465 



Paeonia (peony) 

 Decaj'ing roots Joanissia pennsylvanica n. sp. 



Panicum (panic grass) 

 0\-ipositing in stem Lasioptera panici Felt. 



Papaver (poppy) 

 Stem gall, undescribed Clinodiplosis caulicola Coq. 



PiCEA (spruce) 

 Reared from seed Dasyneura canadensis Felt. 



PiNUS (pine) 

 Apical, bud-like swelling, diameter, 1 cm.; on P. scopulorum. 



Dicrodiplosis gilletlei n. sp. 

 Globose swelling at base of needles; on P. inops. . . . Cecidomyia brachynteroides 0. S. 



Resinous cocoons on needles Cecidomyia inopis O. S. 



Aborted needle clusters, base subglobose; on P. rigida. .Cecidomyia pinirigidoe Pack. 



Similar needles on P. edulis Cecidomyia sp. 



Base of needles of P. radiaia Thecodiplosis piniradialoe Snow & Mills. 



Reared from extruded resinous masses on P. rigida Itonida resinicola O. S. 



Reared from extruded resinous masses on P. radiaia Itonida resinicoloides Wlms. 



Reared from bark of P. inops Winnertzia pinicorlicis Felt. 



Reared from Scolytid galleries in pine Monardia pinicorlicis Felt. 



Cecidomyia hopkinsi n. sp. 

 Reared from fungous affected heartwood, P. rigida Monardia lignivora Felt. 



PisoNiA ACULEATA (Wait-a-bit) 

 Subconic stem gall Brugmanniella mexicana n. sp. 



Plantago (plantain) 

 Gall undetected (?) Lestodiplosis sp. 



Platanus (plane tree) 

 Reared from rolled leaves Lestodiplosis platanifolia Felt. 



PoA PRATENSis (June grass) 

 Gall unrecognized Colpodia pratensis Felt. 



PoLYGONATUM (Solomon's seal) 

 Blister gall, diameter, 4 mm Cecidomyia sp. 



PopuLtJS (poplar) 



Irregular, monothalamous, blister leaf gall Cecidomyia sp. {irregularis Steb.) 



Subglobular leaf galls Rhizomyia absobrina Felt. 



Variable, subglobular leaf gall Dicrodiplosis populi Felt. 



Apparently the same gall Lestodiplosis globosus Felt. 



Subglobular leaf gall, diameter, 3 to 4 mm Mycodiplosis populifolia Felt. 



Irregular, tumid gall at base of leaf, similar to that of Lasioptera vilis . . Cecidomyia sp. 



Marginal leaf roll, length, 1cm Lestodiplosis populifolia Felt. 



Brown, marginal leaf roll, length, 2.5 cm., several larvse Cecidomyia sp. 



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