Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
[cite:373623]
after Hansen 1991 (subfamily status follows Lawrence and Newton 1995) -- matches the classification also followed in American Beetles(1) and herein.
http://www.inhs.uiuc.edu/biod/waterbeetles/hydrophilinae/genera.html

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