300 Wisconsin Academy of Sciences, Arts, and Letters. 
Populus italica. 
ChaitopJiorus leucomelas Koch 
Populus nionilifera. 
Chaitophorus popiiUcola Thomas, 
Chaitophorus stevensis Sanborn. 
Mordwilkoja vagahunda Walsh. 
Pemphigus 'bursarins Linnaeus. 
Pemphigus filaginis Boyer. 
Pemphigus populi-transversus Riley. 
Thecabius affinis Kaltenbach. 
Thecabius populi-condupUfolius Cowen. 
Thecabius popuU-monilis Riley. 
Populus nigra. 
Abamalekia lazarewi Del Guercio. 
Anuraphis populi Del Guercio. 
Aphis longirostris Fabricius. 
Aphis populeti Panzer. 
Aretaphis populi Linnaeus. 
Chaitophorus leucomelas Koch. 
Chaitophorus leucomelas lyratus Ferrari. 
Chaitophorus nassonowi Mordwilko. 
Chaitophorus versicolor Koch. 
Drepanosiphum smaragdinum Koch. 
Drepanosiphum tiliae Koch. 
Lachnus viminalis Boyer. 
Pachypapa marsupialis Koch. 
Pachypapa vesicalis Koch. 
Pemphigus borealis Tullgren, 
Pemphigus bursarius Linnaeus. 
Pemphigus canadensis Del Guercio. 
Pemphigus filaginis Boyer. 
Pemphigus ovata-oblongus Kessler. 
Pemphigus populi Courchet. 
Pemphigus protospirae Lichtenstein. 
Pemphigus pyriformis Lichtenstein. 
Pemphigus spyrothecae Passerini. 
Pemphigus tortuosis Rudow. 
Pemphigus vesicarius Passerini. 
Pterocomma populea Kaltenbach. 
Stagona vesicalis Rudow. 
Stomaphis bobretzkyi Mordwilko. 
Thecabius affi'^^is Kaltenbach. 
Thecabius populicauUs Fitch. 
Thecabius populneus Koch. 
