American Insect Galls: Thompson 63 



PLUM (Prunus) 



53. Eriophyes. Walsh 1 Kept., p. 43, note. Plum species (n. sp.). N. H. Aug. Pinkish 

 elevations on upper sides of leaf, rarely beneath. On wikl plum, plate 17, 53. 

 Unkno^^Ti. 



POISON IVY (Rhus) 



13. Eriophyes. On \ea,i oi Rhus toxicodendron. Garman '83, p. 134. Phytoptus species. Mass. 

 Jun(\ Corrugated areas of same color as leaf crowned with paler warts, plate 18, 13. 



POPLAR (Populus) 



21. . Wart gall on poplar. ' Mass. June. On leaf. Populus tremuloides — Aspen- 

 Irregular, pale green elevations with scabious depressions below, plate 17, 21. 

 Mycodiplosis {'/) populifolia Felt. 



113. Pemphigus (?). Balsam poplar. Mass. July. Globular at base of leaf. 



134. Pemphigus vagabundus. Walsh '69, p. 107-108. Poplar. June, plate 19, 134. 



210. Pemphigus populicaulis. Packard '90, p. 471, fig. 170. Walsh-Riley '68; p. 245. Poplar. 



Mass. June. Size of bullet above; lip thickened on petiole side only below. Fly 



P. popidicauUs, plate 18, 210. 



280. Cecidomyia. Poplar. Mass. May. Sessile, hard, globular, 3 mm. on veins. Open by 



sUt on under side. 



Possibly same as the following. 



281. Cecidomyia. Aspen poplar. N. H. Aug. Globular, 1-2 cm., narrowed toward base on 



top of leaf; below only a sHght, rugose, depressed area on mid-rib or lateral veins; 

 walls thick and hard at side of vein. Cell less than 1-3 diameter, plate 18, 281. 



(;') Mycodiplosis populifolia Felt. 



282. Eriophyes. Populus tremuloides. N. H. Aug. Buds at end of twigs transformed into a 



rosette of aborted, pubescent folds, plate 19, 282. 



289. Ectoedemia poputella. Busck. Populus tremuloides. Sept. Globular. 1-2 cm., suc- 

 culent swelling of petiole at base of leaf blade; sudden, distinct surface, grey-brown 

 and rugose, plate 18, 289. 



323. Eriophyes. Populus tremuloides. June. Scurfy area lighter than leaf on under side or more 

 rarely above. 



ROSE (Rosa) 



261. Cecidomyia. Rose. Mass. July. Leaf folded along mid-vein, .slightly swollen and forms 

 trough inhabited by larvae, plate 19, 261. 

 Dasyneura (}") rosarum Hardy. 



SHAD-BUSH {Amelanchier) 



48. Cecidomyia. Coral Gall of Shad-bush. Amelanchier cnnaden.'^i.'! July-Aug. Mass. On 

 loaf; erect, hard cajisulcs with rolled tip. Larva is dull salmon in color, plate 19, 



48. 



Ilormomyin rnnadensis Felt. 



222. . Rust on Amelanchier. July. On fruit, leaf and jjctioles of berries. Berry 



becomes five or six times its natural size. Yellow spots on account of clusters of 

 cup spores. 



