Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
[cite:386128]
46 spp. illustrated (high-res habitus photos) and described. One of the most helpful and reliable online resources for dytiscid identification.
[the source seems to be no longer available]
http://www.dlia.org/atbi/species/Animalia/Arthropoda/Insecta/Coleoptera/Dytiscidae/index.shtml