Published online by Cambridge University Press: 31 May 2012
The three new species described here were discovered in recent years in the course of forest aphid studies in central Canada.
Measurements used in this paper are in millimetres. The number of specimens of each form of the aphid measured is shown and the range of measurements given in parentheses. The single measurement preceding the parentheses is not an average, but refers to a single representative specimen.
1 Contribution No. 874, Forest Entomology and Pathology Branch, Department of Forestry, Ottawa, Canada.