•KEY TO AMERICAN INSECT GALLS 



39 



Longitudinal fold galls dwarfing the leaf. Fig. 42. 



Itonid. Cecidomyia sp. 

 Light red, cockscomb-like gall developing on the upper surface from the mid- 

 vein. Pack. '90, p. 472 



Aphid. Pemphigus populi-venae Fitch 

 A rib gall on the main vein, on P. heterophylla. Chad. '08, p. 137 



Acarid. ? Eriophyes sp. 

 Irregularly folded, convolute mass of foliage some 2 inches in diameter, frequently 

 apical. Fig. 43- Felt 'o6b, p. 635 



Aphid. Vagabond gall. Pemphigus vagabundus Walsh 

 Irregular, pinkish and light green, pod-shaped shelters formed by apposed leaf 

 edges and containing numerous white plant lice, length 2.5 to 3 cm, diameter 

 I cm, on Lombardy poplar. 



Aphid. Purse leaf gall, P'e mphigus affinis Kalt. 



Fig. 44. Ribbed petiole gall, Ectoedemia popu- 

 1 e 1 1 a Busck. (Original) 



An olive buff to olive brown erineum or dimple, slightly indented on the under 

 side of the leaf, diameter 6.5 mm or less, one to eight on a leaf. Chad. '08, 



P- 137 



Acarid. Eriophyes sp. 



Dimples " on the leaves on the upper side, lined with spherical granules, reddish 

 or greenish in color." The galls are green, 3 or 4 on a leaf, diameter 2 to 3 mm, 

 possibly identical with the preceding. Chad. '08, p. 137 



Acarid. Eriophyes sp. 

 White to dark brown erineum or dimple gall on the under side of the leaf of 

 P. grandidentata. Chad. '08, p. 136 



Acarid. Eriophyes sp. 



A small, green or red, pocket gall on the upper side of the leaf of 

 P. grandidentata. Chad. '08, p. 136 



Acarid. Eriophyes sp. 



