146 Wisconsin Academy of Sciences, Arts^ and Letters. 
ribis, 3Iyzus Linnaeus var. trifasciata, Del Guercio, 18 94. IL Nat- 
uralista Siciliano, XIII, p. 197. 
Rihes vulgare. 
riccobonii, Pemphigus Stefani, 1899. Riv. Ital. Sci. Nat., XIX, p. 
1 . 
Pistacia atlantica. 
rileyi, Lachnus Williams, 1911. Aphididae of Nebraska, p. 24. 
Pinus strobus, P. sylvestris. 
rileyi, Pemphigus? Stebbins, 1910. Springfield Mus, Nat. Hist., 
Bui. 2, p. 9, fig. 
Populus tremuloides. 
rileyi, Phylloxera Riley, 18 74. Sixth Rept. Nox & Ben. Insects 
Mo., p. 64. 
Quercus alba, Q. bicolor, Q. obtusiloba. 
rileyi, Eriosoma Thomas, 1877. Trans. Ill. Hort. Soc. p. 191. 
New name for Eriosoma ulmi Riley. 
Ulmus americana. 
rimosalis, Phylloxera Pergande, 1904. Proc. Dav. Acad. Sci., IX. 
p. 217. 
Carya alba. 
ripariae. Aphis Oestlund, 1886, Aphididae of Minnesota, p. 41. 
Yitis cordifoUa, Y. milpina. 
*rpaidus, Dryobius Snellen Van Vollenhoven, 1862. Tidjschr. Ent. 
Ned. Ent. Ver., V, p. 95, pi. 5, pp. 1—3. 
Food plant? 
rjabushinskiji, Acyrthosiphon Mordwilko, 1914. Fauna of Rus¬ 
sia, (Insecta Hemiptera), I, Petrograd, app. p. 5. 
Food plant? 
robiuiae. Aphis Macchiati, 1885. Bui. Soc. Ent. Ital., XVII, p. 65. 
Ribinia pseudo-acaciaf 
robiniae, Callipterus Gillette, 1907. Can. Ent. XXXIX, p. 395, 
fig. 
Ribinia pseudo-acacia. 
roboris, Pterochlorus (Linnaeus), 1758. Edition 10, Systema 
Naturae, p. 452. Aphis. 
Fagus sylvatica, Picea abies, Pinus sylvestris, Quercus cerris, Q. 
ilex, Q. robur. 
