44 Wisconsin Academy of Sciences, Arts, and Letters. 
bicdlor, Aphis Koch, 1855. Die Pflanzenlause Aphiden, p. 139, fig. 
Galium veruni. 
bicolor, Callipterus Koch, 1855. Die Pfianzenlause Aphiden, p. 
212, fig. 
No Food plant with the original description, 
bicolor, Pterocomma (Oestlund), 1887. Aphididae of Minnesota, 
p. 3 6. Melanoxanthus. 
Populus halsamifera, Salix sp. 
bienis Myzus Sanborn. 
• bifrons, Aphis Walker, 1848. Ann. Mag. Nat. Hist., ser. 2, I, p. 
444. 
Alnus glutinosaf 
bifrontis, Macrosiphum (Passerini) 1879. Bui. Soc. Ent. Ital., XI, 
p. 45. Siphoiiophora. 
Inula viscosa. 
bignoniae, Sipha Macchiati, 1883. Bui. Soc. Ent. Ital., XV, p. 362. 
Lachjius. 
Catalpa Mgnonioides, Tecoma radicans. 
bipunctatimi, Phylloxera Lichtenstein, 1874. Bui. Soc. Ent. 
Prance, p. GDI. 
Quercus sp. 
bituberculata, Aphis Wilson, 1913. Ent. News, XXV, p. 298, fig. 
Saccharum officinarum. 
bituberculata, Pterocomma Theobald, 1912, Kept. Econ. Zool., 
Year ending Sept. 30, 1912, pp. 82-84, figs. 
Food plants? 
bobretzkyi, Stomaphis Mordwilko, 1901. Horae Soc. Ent. Ross., 
XXXIII, p. 412. 
Populus nigra, Salix sp. 
bogdanowi, Lachnus Mordwilko, 18 95. Rab. Lab. Zool. Kab. 
Varch. Univ. p. 115. 
f 
Picea aMes. 
For description in German see Zool. Anz. XVIII, 1895, p. 97. 
borealis. Pemphigus Tullgren, 1909. Ark. Zool. V, No. 14, p. 142, 
fig. 
Populus nigra, P. pyramidalis. 
