Family Hydrophilidae

• Subfamily Hydrochinae
  • Hydrochus currani Brown
  • Hydrochus granulatus Blatchley
  • Hydrochus pseudosquamifer Miller
  • Hydrochus rufipes Melsheimer
  • Hydrochus scabratus Mulsant
  • Hydrochus squamifer LeConte
• Subfamily Helophorinae
  • Helophorus tuberculatus Gyllenhal
  • Helophorus linearoides d'Orchymont
  • Helophorus sempervarians Angus
  • Helophorus lineatus Say
  • Helophorus orientalis Motschulsky
  • Helophorus linearis LeConte
  • Helophorus lacustris LeConte
  • Helophorus columbianus McCorkle
  • Helophorus furius Smetana
  • Helophorus nitidulus LeConte
  • Helophorus eclectus d'Orchymont
  • Helophorus oblongus McCorkle
  • Helophorus inflectus McCorkle
  • Helophorus nitiduloides d'Orchymont
  • Helophorus leechi McCorkle
• Subfamily Hydrophilinae
  • Hydrophilus triangularis Say
  • Tropisternus lateralis marginatus Motschulsky
  • Tropisternus lateralis nimbatus (Say)
  • Tropisternus ellipticus (LeConte)
  • Tropisternus columbianus Brown
  • Hydrochara obtrusata (Say)
• Subfamily Hydrobiinae
  • Tribe Hydrobiini
    • Laccobius agilis (Randall)
    • Laccobius arenarius Willson
    • Laccobius borealis Cheary
    • Laccobius carri d'Orchymont
    • Laccobius cinereus columbianus Miller
    • Laccobius mexicanus d'Orchymont
    • Laccobius reflexipenis Cheary
    • Laccobius spangleri Cheary
    • Hydrobius fuscipes (Linneaus)
    • Ametor latus (Horn)
    • Ametor scabrosus (Horn)
    • Paracymus subcupreus (Say)
    • Crenitis morata (Horn)
    • Crenitis digesta (LeConte)
    • Crenitis alticola (Fall)
    • Anacaena limbata (Fabricius)
  • Tribe Helocharini
    • Enochrus piceus piceus Miller
    • Enochrus pygmaeus nebulosus (Say)
    • Enochrus diffusus (LeConte)
    • Enochrus hamiltoni (Horn)
    • Cymbiodyta acuminata Fall
    • Cymbiodyta columbiana Leech
    • Cymbiodyta dorsalis (Motschulsky)
    • Cymbiodyta minima Notman
    • Cymbiodyta toddi Spangler
    • Cymbiodyta vindicata Fall
• Subfamily Chaetarthrinae
  • Chaetarthria nigrella (LeConte)
  • Chaetarthria pallida (LeConte)
  • Chaetarthria hespera Miller
• Subfamily Berosinae
  • Berosus fraternus LeConte
  • Berosus hatchi Miller
  • Berosus oregonensis Miller
  • Berosus peregrinus (Herbst)
  • Berosus striatus (Say)
  • Berosus stylifer Horn
• Subfamily Sphaeridiinae
  • Cercyon spp.
• Subfamily Georyssinae
  • Georyssus sp.