Hydrophilidae Latreille, 1802
Tropisternus affinis Motschulsky, 1859
Tropisternus apicipalpis (Chevrolat, 1834)
Tropisternus blatchleyi Orchymont, 1922
Tropisternus californicus (LeConte, 1855)
Tropisternus chalybeus Laporte, 1840
Tropisternus collaris (Fabricius, 1775)
Tropisternus columbianus Brown, 1931
Tropisternus cordieri Orchymont, 1922
Tropisternus crassus Sharp, 1882
Tropisternus glaber (Herbst, 1797)
Tropisternus laevis (Sturm, 1826)
Tropisternus lateralis (Fabricius, 1775)
Tropisternus mergus Say, 1835
Tropisternus mixtus (LeConte, 1855)
Tropisternus natator Orchymont, 1938
Tropisternus niger Orchymont, 1938
Tropisternus obscurus Sharp, 1882
Tropisternus orvus Leech, 1945
Tropisternus quadristriatus (Horn, 1871)
Tropisternus sahlbergi (Sharp, 1883)
Tropisternus salsamentus Fall, 1901
Tropisternus sublaevis (LeConte, 1855)