Wilson-Vickery—List of Aphididae. 
Ill 
oblonga, Lachniella Del Guercio, 1909. Redia, V, p. 289, fig. 
Pinus silvestris. 
oblongum, Macrosiphum (Mordwilko), 1901. Horae Soc. Ent. 
Ross., XXXIII, p. 3 43. Siphonophora. 
Artemisia vulgaris. 
oblongus, Sinydobius (Heyden), 1837. Ent. Beitr. Muse. Senk., 
II, p. 298. Aphis. 
Betula alba. 
obuoxia, Aphis Mordwilko, 1916. (Rept. Ent. Bur. Stavropol 
1914) Published by Dept. Agr. of Min. of Agr. Petrograd. 
(Rev. Applied Ent. IV, Ser. A, part 11, p. 459). 
obscura, Macrosiphum (Koch), 1855. Die Pflanzenlause Aphiden, 
167, fig. Siphonophora. 
Hieracium yrealtum. 
obscura, Schizoneura Walker, 1852. List Homop. Insects Brit. 
Museum, part 4, p. 1051. 
No food plant given. 
obtectus, Cliermes Ratzeburg, 1844. Die Forst-Insecten, p. 200, 
foot note. 
Pinus sp. 
occidentalis, Forda Hart, 1894. Eighteenth Rept., State Ent. Ill., 
p. 95, fig. 
Capsella bursa-pastor is, Poa pratensis, Zea mays. 
occidentalis, Lachnus Davidson, 19 09. Jour. Econ. Ent., II, p. 
300. 
Abies grandis. 
ochrocentri. Aphis Cockerell, 1903. Ent. News, XIV, p. 248. 
Carduus ochrocentrus. 
ochropus, Aphis Koch, 1854. Die Pflanzenlause Aphiden, p. 128, 
fig. 
Chenopodium album, Dipsacus sylvestris, Rumex altissimus. 
oenanthis. Aphis Lichtenstein, 1884. La Flore des Aphidens, p. 
36. No description. 
Oenanthe sp. 
oenotherae, Anoecia Wilson, 1911. Can. Ent., XLIII, p. 63. 
Oenothera sp. ■ i '■" 'fWU 
