Abstract
The Woolly Aphid of the elm ( Schizoneura americana ) was first described by Riley (15) in 1879. Later papers, dealing with the ecology and external anatomy, were published by Gillette (7), Lugger (9), Aldrich (1), Patch (14) and Davidson (4). However, no detailed work has been done on the internal anatomy of this species. Other aphids have been used as material for study and these include the work of Mark (10), Witlacqil (21), Mordvilko (11), Flogel (6), Davidson (5), Baker (2), Shibata (16), Knowlton (8) and Weber (18-20)
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