Abstract
Generations of entomologists have learned and taught that the Colorado potato beetle, Leptinotarsa decemlineata (Say), originally lived on the eastern slopes of the Rocky Mountains and fed on buffalo bur (or sand bur), Solanum rostratum Dunal. As the story goes, when the settlers moved west and planted the potato, Solanum tuberosum, in the foothills of these mountains, the beetle adapted to this new host, subsequently moving east from one potato patch to another. This account, which has been presented in most textbooks on economic entomology (Sanderson 1921, Metcalf and Flint 1928, Davidson and Lyon 1979), had its origins with Walsh (1865). Riley (1869) accepted the account of Walsh (1865), and it has been accepted since.
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