140 Wisconsin Academy of Sciences, Arts, and Letters. 
pimicella, Aphis Theobald, 1915. Bui. Ent. Research, VI, p. 125, 
fig. 
Punica granatum. 
pui’piirea, Phylloxera Pergande, as a var. of P. symmetrica Per- 
gande, which see. 
purpurascens, Macrosiphum (Oestlund), 188 7. Aphididae of 
Minnesota, p. 81. Nectarophora. 
Thalictrum revolutum. 
pyrarius, Myzus Passerini, 1861. Atti. Soc. Ital. Sci. Nat. Ill, 
p. 399. 
Pyrus communis. 
pyrastri, Aphis Boisduval, 1867. Essai sur Entom. Hort. p. 253. 
Pyrus communis. 
pyri, Aphis Boyer de Ponscolombe, 1841. Ann. Soc. Ent. Prance, 
X, p. 189. 
Crataegus oxyacantlia, Prunus domestica, Pyrus communis, P. cor- 
onaria, P. germanica, P. malus. 
pyri, Aphis Hartig, 1841. Zeit. Ent. (Germar), III, p. 3 69. 
Pyrus malus. 
pyri, Aphis Kittel, 1827. Mems. Soc. Linn. Paris, V. p. 150. 
Pyrus noMlis. 
pyri. Aphis Koch, 1854. Die Pflanzenlause Aphiden, p. 60, fig. 
Pyrus communis, Tussilago farfare. 
*pyri, Eriosoma Westwood, 1849 The Gardeners’ Chronicle, p. 
755. 
Pyrus. 
pyri Lachnus Buckton, 1899. Ind. Mus. Notes, IV, p 274. 
Pyrus communis. 
pyri Prociphilus (Pitch), 1851. Kept. Reg. Univ. State N. Y. Cab. 
Nat. Hist. p. 68. Eriosoma. 
Crataegus sp., Pyrus communis, P. malus.? 
pyHcola Erisoma Baker & Davidson, 1916. Jour. Agr. Research, 
Washington, D. C. VI, No. 10, p. 358. fig. 
Pyrus communis, Vlmus sp. 
