KEY TO AMERICAN INSECT GALLS 



37 



Subglobular lateral gall with dead area on one side, diameter 9 mm. PI. 11, 

 fig. 8. Felt 'i5e, p. 100 



Itonid. Rhabdophaga globosa Felt 

 Abrupt, elongate twig swelling, length 10 to 35 mm, height 8 to 11 mm, width 

 7 to 12 mm, onS. rostrata. Rohw. '09, p. 18 



Hym. Euura bebbianae Rohw. 

 Lateral, monothalamous twig enlargements 4 to 9 mm long, 3 to 4 mm wide. 

 Rohw. '09, p. 10 



Hym. Euura orbitalis Nort. 

 Aborted, lateral, pale, roughened twig swellings, length 10 mm, width 7 mm. 

 Rohw. '09, p. II 



Hym. Euura cooperae CkU.,, 

 Globose, constricted twig swellings, diameter 1.5 cm. Chitt. '00, p. 68 



Coleop. Agrilus politus Say 



fPig. 42. C e^c i d o m y 1 a sp., 

 the larvae producing a midvein 

 fold. (Original) 



Irregularly ovate twig swelling, length 4 cm, diameter 3 cm. Felt & Joutel 



'04, P- 73 



Coleop. Saperda concolor Lee. 

 Irregular, branch and trunk swellings, mostly on branches or smaller stem s 

 produced by transverse galleries just under the bark. Felt 'o6b, p. 103 



Coleop. Mottled willow borer, Cryptorhynchus lapathi 



Linn. 



Populus (poplar) 

 Irregular, greenish, subtr.iangular, monothalamous petiole or twig galls, length 

 I cm, diameter .7 cm, on cottonwood 



Itonid. Cecidomyia sp. ai5i3 

 Globose, purplish, sometimes adherent masses of deformed flowers, diamete 

 1.5 cm, from Mojave desert 



Acarid. Eriophyes sp. a276i 



