226 Wisconsin Academy of Sciences^ Arts, and Letters. 
Crataegus crus-galli. 
Aphis pomi DeGeer. 
Pemphigus corrugatans Sirrine. 
Crataegus “niacrocapetra”. 
Pemphigus corrugatans Sirrine, 
Crataegus occidentalis. 
Pemphigus corrugatans Sirrine. 
Crataegus oxyacantha. 
Aphis avenae Fabricius. 
Aphis crataegi Kaltenbach. 
, Aphis crataegi Koch. 
Aphis edentula Buckton. 
Aphis padi Linnaeus. 
Aphis pomi DeGeer, 
Aphis pyri Boyer. 
Aphis rumicis Linnaeus. 
Aphis sorhi Kaltenbach. 
Macrosiphum crataegaria Walker. 
Macrosiphum crataegi Monell. 
Myzus oxycanthae Schrank. 
Ovatus mespili Van Der Goot. 
Pemphigus corrugatans Sirrine. 
Prociphilus crataegi Tullgren. 
Tetraneura ulmi Linnaeus. 
Crataegus punctata^C. tomentosa. 
Aphis crataegifoliae Fitch. 
Eriosoma crataegi Oestlund. 
Macrosiphum crataegi Monell. 
Crataegus tomentosa. 
Eriosoma crataegi Oestlund. 
Pemphigus corrugations Sirrine. 
Crepis biennis. 
Aphis centaureae Koch. 
Macrosiphum jaceae Linnaeus. 
Macrosiphum hierachii Kaltenbach. 
Macrosiphum picridis Fabricius. 
Macrosiphum riMcola Kaltenbach. 
Macrosiphum sonchi Fabricius. 
Trama radicis Kaltenbach. 
Trama troglodytes Heyden. 
