Borowiec L. (200_-2013) Chrysomelidae: The leaf beetles of Europe and the Mediterranean subregion (checklist and iconography)
[cite:364031]
An excellent guide with a complete illustrated list of European taxa with distribution data, compiled and maintained by a wold's top chrysomelid expert. The source is increasingly relevant to our area because of the growing number of Palearctic leaf beetles showing up and establishing in North America.
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.)
Quinn M. (2010) North American Cryptocephalus species (Chrysomelidae, Cryptocephalinae)
[cite:386106]
A photo guide to our fauna of the Cryptocephalini (sans Pachybrachys) showing all but 10 spp. arranged by species groups adopted in(1). Extremely helpful.