Abstract
A preliminary summary of studies on the comparative biology of the potato leafhopper, Empoasca Fabae (Harris), and five closely related species of Empoasca (all described by DeLong) as follows: (abrupta, bifurcata, erigeron, recurvata, solana. Evidence is presented which indicates that E. fabae does not overwinter in the north but migrates northward each season.

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