INSECTS AFFECTING PARK AND WOODLAND TREES 



745 



WILLOW GALLS 



Twig galls 



Euura orbitalis Norbfenlarged, lateral, monothalamous bud gall. Ent. Soc. Phila. 

 Proc. 6 : 250 



Euura nodus Walsh, smooth twig enlargement, one fourth to twice normal diam- 

 eter. Ent. Soc. Phila. Proc. 6:253 



Euura ovum Walsh, oval, monothalamous twig gall, on one side. Ent. Soc. Phila. 

 Proc. 6:251 



Cecidomyia cornuta Walsh, larva bores stems affected by C. brassicoides. 

 Ent. Soc. Phila. Proc. 3:625 



Cecidomyia coryloides Walsh, large, monothalamous, apical ; resembling a bunch 

 of hazelnuts. Ent. Soc. Phila. Proc. 3 : 588 



Cecidomyia hordeoides Walsh, resembles four rowed barley, twig not enlarged as 

 in C. t r i t i c o i d e s. Ent. Soc. Phila. Proc. 3 : 599 



Cecidomyia nodulus Walsh, smaller, though similar to C. batatus, but mono- 

 thalamous. Ent. Soc. Phila. Proc. 3 : 599 



Cecidomyia triticoides Walsh, polythalamous, woody, resembling a wheat head, 

 m - ^nt. ^ oc - P ni l a - Proc. 3:598 



Rhabdophaga batatas Walsh, irregular polythalamous swelling. Ent. Soc. Phila. 

 Proc. 3 : 601 



Rhabdophaga rhodoides Walsh, monothalamous roselike galls at tip of twigs. 



Ent. Soc. Phila. Proc. 3 : 586 

 Rhabdophaga siliqua Walsh, monothalamous solitary oval, apical woody gall, 



l / 2 -\ in. Ins. Galls Ind. p. 840 



* Leaf galls 



Pontania borealis Marlt., solitary, smooth, reddish, pyriform, % in., y< below. 



Dyar. N. Y. Ent. Soc. Jour. 6: 121 

 Pontania consors Marlt., gregarious, hairy, spheric, near leaf base, % in. Dyar. 



N. Y. Ent. Soc. Jour. 6:121 

 Pontania gracilis Marlt., green, spheric gall, equally on both surfaces. Dyar. N. Y. 



Ent. Soc. Jour. 5 : 197 

 Pontania terminalis Marlt., green swelling on upper surface. Dyar. N. Y. Ent. 



Soc. Jour. 5 : 24 



Rhabdophaga brassicoides Walsh, bunches of oval, monothalamous, sessile galls, 

 V^-^yi hi. Ent. Soc. Phila. Proc. 3 : 577 , 



Rhabdophaga gnaphaloides Walsh, apical, solitary, subspherical, ' + 1 . in. Ent. 

 Soc. Phila. Proc. 3 : 583 



Rhabdophaga strobiliscus Walsh, pine cone-shaped gall. Ent. Soc. Phila. Proc. 

 3:582 



Cecidomyia verruca Walsh, small, monothalamous, irregularly spheric gall. Ent. 

 Soc. Phila. Proc. 3 : 606 



Phylloxera salicicola Perg., woolly aphids in bark crevices and leaf buds. Daven- 

 port. Acad. Sci. Proc. 9 : 267 



Eriophyes salicicola Garm., longitudinal leaf folds. Pack. p. 595 



Acarus aenigma Walsh, polythalamous, irregular, spheroidal, almost sessile mass of 

 bud or leaf tissues, ^-i 1 10 in- Ent. Soc. Phila. Proc. 3:608 



Acarus semen Walsh, small, roughened, greenish yellow, mostly on upper surface. 

 Ent. Soc. Phila. Proc. 3 : 606 



