Derunkov et al. (2013) Diabrotica ID: Identification of Diabrotica species (Col.: Chrysomelidae) from North and Central America
Derunkov A., Konstantinov A., Tishechkin A., Hartje L., Redford A.J. (2013) Diabrotica ID: Identification of Diabrotica species (Coleoptera: Chrysomelidae) from North and Central America
[cite:500945]
a simplified key adapted by C.G. Majka from(1)
NB: Use the key with utmost caution beyond the indicated area, since adjacent areas (e.g. QC, ON, NY...) have much richer Calligrapha faunas
[Online] Guide to Palearctic flea beetle genera, by Alexander S. Konstantinov and Natalia J. Vanderberg
Nice online key to genera of Palearctic flea beetles; also can be used as a key to the Nearctic genera I've found: http://www.sel.barc.usda.gov/Coleoptera/fleabeetles/fleas.htm (Authors are at the Systematic Entomology Laboratory, USDA-ARS.)