q6 MAINE AGRICULTURAL EXPERIMENT STATION. I913. 



Pemphigus filaginis Boy de Fonsc. (gnaphalii Kalt.) (Proci- 

 philus gnaphalii Koch.) (Pachypappa marsupialis Koch) 

 (ovato-oblongus Kessler). Tullgren, 1909, p. 136. 



Pemphigus glandifonnis Rudow. Rudow, 1875, P- 247. 



Pemphigus populicauUs Fitch. Jackson, 1908, p. 193. 



Pemphigus protospirae Licht. Tullgren, 1909, p. 155. 



Pemphigus spirothecae Pass. (affinis Koch). Tullgren, 1909, 

 p. 161. 

 P. tremula L,. 



Aphis populi iremulae Ascanius. Hagen, p. 449. 



Asiphum populi (Fab.) Koch. Koch, p. 246. 



Asiphum tremiilae DG. Tullgren, 1909, p. 66. 



Chaitophorus populi (Linn.) Pass. (Myzaegirus Amyot) 

 (Arctaphis populi .Walker). Buckton, 2, p. 142. 



Chaitophorus populi (Linn.) (Ch. tremulae Koch). Koch, p. 9. 



Chaitophorus irersicolor Koch. Passerini Flora. 



Pachypappa lactea Tull. Tullgren, 1909, p. 72. 

 P. tremuloides Michx. (trepida). American aspen. 



Aphis populifoliae Davis, 1910. Patch, 1-913, Bui. 213, p. 82. 



Aphis (Dactynus) populiis-trepida Raf. Rafinesque, 1818. 



Chaitophorus bruncri Williams. Williams, 1910. (1911), p. 26. 



Chaitophorus delicata Patch. Patch, 1913, Bui. 213, p. 80. 



Chaitophorus populicola Thomas. Gillette, 1909a, p. 388. Patch, 

 1913, Bui. 213, p. 78. 



Cladobius beulahensis Cockerell. Cockerell, 1904, p. 263. 



Pemphigus populicauUs Fitch. Hunter, 1901, p. 78. 



Pemphigus? rileyi Stebbins. Stebbins, 1910, p. 9. 

 P. trichocarpa Torr. & Gray. 



Chaitophorus populicola Thos. (?). Essig, 1909, p. 98. 



Chaitophorus saliclcola Essig. Essig, 1911b, p. 534. 



Eichochaitophorus populifolii Essig. Essig, 1912a, p. 715. 



Pemphigus populicauUs Fitch. Essig, 1912a, p. 712. 



Pemphigus populimonilis Riley. Gillette, 1909a, p. 356. 



Pemphigus populitransversus Riley. Davidson, 1910, p. 372. 



P. sp. 



Aphis populi-albae Boyer. Lichtenstein, La Flore. 



Byrsocrypta vagabunda Walsh. Walsh, 1862, p. 306. (migrants 



"on various forest trees")- 

 Chaitophorus albus Mordwilko. Mordwilko, 1899 (1901), p. 410. 

 Chaitophorus populifoliae Fitch. Davidson, 1910, p. 375. 

 Cladobius longirostris Mordwilko. Mordwilko, 1899, (1901), p. 



Cladobius rufulus Davidson. Davidson, 1910, p. 375. 

 Lachnus -longistigma Monell. Sanborn, 1904, p. 31. 

 Pemphigus borealis Tullgren. Tullgren, 1909, p. 146. 

 Pemphigus immunis Buckton. Buckton, 1896, p. 51. 

 Pemphigus infaustus Ferrari. Lichtenstein, 1885 ("var. de P. 

 '^oirothecae Pass."). 



