Wilson-Vickery—List of Aphididae. 
119 
onopordi, Aphis Schrank, 1801. Fauna Boica, II, p. 121. 
Carduus nutans, Cirsium lanceolatum, Onopordon illyricum. 
opium, Aphis, Buckton, 1879. Mon. Brit. Aphides, II, p. 101, fig. 
Doronicum cruenta. 
opuli. Aphis Sulzer, 1776. Abgekurz Gesch. Ins. p. 105, fig. 
Viburnum opulus. 
oreaster. Aphis Rafinesque, 1818. Amer. Mon. Mag. & Critic. 
Rev. Ill, p. 17. 
Aster paniculata. 
oregonensis, Aphis Wilson, 1915. Trans. Amer. Ent. Soc. XLI, p. 
9 2, fig. 
Artemisia tridentata. 
oregonensis, Lachiius Wilson, 1915. Trans. Amer. Ent. Soc. XLI, 
p. 103, fig. 
Pinus sp. 
oregonensis, Microsiphum Wilson, 1915. Trans. Amer. Ent. Soc. 
XLI, p. 91, fig. 
Artemisia tridentata. 
orientale, Acyrthosiphon Mordwilko, 1914. Fauna of Russia, (In- 
secta Hemiptera), I, Petrograd., p. 141. 
Food plant? 
orientale, Macrosiphum Van Der Goot, 1912. vjijdschr. voor Ent. 
deel LV, p. 322. 
Blumea balsamifera. 
orientalis, Ohermes Dreyfus, 1889. Tag. 61 Vers. Deut. Nat,, 
Koln. pt. 2, p. 60. 
Picea ahies, P. 'orientalis, Pinus orientalis, P. strobus, P. sylves- 
tris. 
(Cholodkovsky (1915) gives this species as a synonym of 
Chermes pini Koch but indicates that it should be known as 
one of two varieties of that species.) 
origanl. Aphis Passerini, 1860. Gli Afidi, p. 36. 
Calamintfia acinos, Carduus sp.. Origanum paniculatum, 0. vuh 
gare., Satureja nepeta, 8. vulgaris. 
orobanches, Aphis Passerini, 1870. Bui. Ent. Soc. Ital., XI, p. 45. 
Orobanche lutea, 0. muteli, 0. ramosa, Lathraea squamaria. 
