620 



NEW YORK STATE MUSEUM 



SiiKill, likuhlerliko galls on u])per surfacf <if soft iivipl'- k';ivcs 



Hhiddt-r niaiilf gall, )•', r i o p li y f s q u a d r i ]> e s, p. 630 



- ///<'<7///;' liilt/cil 

 Sid)-globular greenish or whitish galls on holh sidt-s of k-af 



Linden wart gall, C c c i d (i ni y i a \- e r r u r i r o 1 a, ]). 63 f 

 Top-sha|)ed galls on u[)|n."r siirfacc of linden leaves 



Linden mite gall, L r i o p h y e s a b n o r ni i s, p. 63 i 



.Iffi-i'/iiii; ask 

 Elongated, greenish or reddish brown galls on the leaf midrib 



Ash midrib gall, (J e c i d o m y i a jj e 1 1 e x, p. 632 

 Lobulate green or brown deformed ratkins 



Ash llou er gall. E r i o p h yes f r a x i ;. i f 1 o r a, p. 633 

 Ajfcctiiii^ dm 

 Cockscomblike structures on the upjier surfac e of elm leaves 



Cocksccnnb elm gall, C o 1 o p h a u 1 m i <■ <j 1 a, ]i. 1.S6 

 Solitary, spindle-shaped galls on the npper surface of red elm leaves 



Red elm leaf gall, V e ni p h i g us u 1 m i f u s u s, j). 633 



.■Iffiiliiii; po[<lar 

 Irregidar, subglobular enlargements of the young twigs 



l'o[)lar twig gall, A g r o m y /. a a e n e i v e n t r i s, p. 634 

 Folded, convolute masses of foliage 



Vagabond gall. Pemphigus v a g a b u n d u s, j), 635 

 Oval, somewhat elongated galls on the leaf petioles of Cottonwood 



Poplar leal stem gall, P e m p h i g u s ]> o p u 1 i - t r a n s v e r s u s, ]). 635 

 Lnperfect, globular galls at base of Cottonwood leaves 



Basal leaf gall, P e m p h i g u s p o p u I i c a u 1 i s, p. 636 



Afft-(-/i/ii^ -ri'/V/t'ii's 

 Galli on shoots 



Fusiform ajiical galls Willow ilub gall, R h a b d o p h a }; a rigidae, p. 636 



Irregular fusiform enlargements on the young shoots 



European willow gall midge, R h a b il o p h a g a s a 1 i c i s, p. 299 

 Galls on Imfrs 



Smooth, globular or slightlv oval galls like a miniature ap]ile, occur on the leaf midrib 



■Willow a])ple gall, P o n t a n i a ]i o ni n m, ]i. 636 



Subspheric, pealike, yellowish galls on the underside of willow leaves 



P o n t a n i a pis u ni, p. 637 



