116 PRELIMINARY LIST 



Fort Collin^, July 12tb, on Populiis mnnilifera. t'orniiiig a 

 pseudo ^all by causing the upper surfaces of the leaf to fold 

 together along the midrib(CoA\en). 



Pemphigus populi-inonilis Riley and MonelL 



In Colorado, on narrow leaved cottonwood (Fuley and Monell, 1). 



Fort C«dlins, July 17th, in typical moniliform galls on 

 leaves of Populus angustifolia; Hotchkiss, Delta County, 

 July 14th. on the same host plant. Only one iiidivi<]ual was 

 found in each gall (Oowen). 



Pemphigus popiili-ramulornm Kiley and ]SIonell. 



On Populus balsanailera, Colorado (Kiley— see Kiley and Monell, 1). 



Fort Collins, July 12th, on Populus monilifera, in galls at 

 base of i^etiole and on twigs. Sometimes the galls of this 

 species are far enough up the petiole to be almost distinct 

 from the twig, and are then (piite similar to those of P. 

 populi-transversus (Cowen) . 



Pempliigtis populi-transversus Kiley and ^lonell. 



(^n I'opulus raonilifera and P. balsamifera, Colorado (Kiley -see Hiley and 

 and Monell, I). 



Ftirt Collins. -Jnly 12th, in typi'-nl galls with transA'erse 

 openings, on petioles of Populus monilifera (Cowen). 



Pemphigus vagabiindus Walsh. 



Fort Collins, galls on Poi)ulus (Blinn). 



Colopha nhnicola Fitch. 



Fort Collins, July 8th, in "cockscomb"' galls on Clmus 

 americana. Five of the specimens examined have the 

 culiital vein of fore wings simple (Cowen). 



Schizonenra americana Kiley. 



Fort Collins, June 17th, on Ulmiis americana (Cowen). 



Schizoiieura lanigera Flausni. 



Boulder, Denver, (Janon City, Delta, and Crand Junction, 

 on apple, common (Gillette). Hotchkiss, Delta County, 

 August L'od. on yonng shoots of crab-apple (Cowen). 



Schizonenra qiierci Fitch. 



"\Viii';less I'rii'iii: Lur.^t'sl ;i little ovci- 1 mm. loii.^-. very wooly, luiit'ormly pale .mrfn. 

 excopi toes wliieli ;iie re<l. and bhirU lipof beak. Heal; reaeliiii:; slightly Ix'.yoml secimd 



