260 Wisconsin Academy of Sciences, Arts, and Letters, 
l/actuca sp. 
Macrosiphum solanifolii Ashmead. 
Pemphigus lactucae Westwood. 
Rhopalisiphum lactucellum Theobald. 
Lactuca macrophylla. 
Macrosiphum allariae Koch. 
Macrosiphum kaltenbachi Schouteden. 
Lactuca muralis. 
Macrosiphum muralis Buckton. 
Macrosiphum rudbeckiae Fitch. 
Lactuca oleracea. 
Macrosiphum lactucae Linnaeus. 
Rhopalosiphum lactucae Kaltenbach. 
Lactuca perennis. 
Macrosiphum lactucae Linnaeus. 
Lactuca pulchella. 
Macrosiphum erigeronensis Thomas. 
Lactuca saligna. 
Pemphigus hursarius Linnaeus. 
Lactuca sativa. 
Macrosiphum ulmariae Schrank. 
Lactuca scariola. 
Aphis lactuca Boyer. 
Macrosiphum alliariae Koch. 
Macrosiphum erigeronensis Thomas. 
Macrosiphum lactucae Linnaeus. 
Macrosiphum lactucae Passerini. 
Macrosiphum pisi Kaltenbach. 
Mocrosiphum rudbeckiae Fitch. 
Macrosiphum sonchi Linnaeus. 
Macrosiphum ulmariae Schrank. 
Pemphigus bursarius Linnaeus. 
Pemphigus lactucarius Passerini. 
Rhizobius lactucae Fitch. 
Rhopalosiphum lactucae Kaltenbach. r 
Trama caudata Del Guercio. 
Trama radicis Kaltenbach. 
Trama troglodytes Heyden. 
