Dytiscidae Leach, 1815
Hydrocolus deflatus (Fall, 1923)
Hydrocolus filiolus (Fall, 1923)
Hydrocolus heggiensis Ciegler, 2001
Hydrocolus oblitoides Roughley & Larson in Larson, Alarie & Roughley, 2000
Hydrocolus oblitus (Aubé, 1838)
Hydrocolus paugus (Fall, 1923)
Hydrocolus persimilis (Crotch, 1873)
Hydrocolus rubyi (Larson, 1975)
Hydrocolus rufiplanulus (Fall, 1923)
Hydrocolus rupinus Roughley & Larson in Larson, Alarie & Roughley, 2000
Hydrocolus sahlbergi Nilsson, 2001
Hydrocolus stagnalis (Gemminger & Harold, 1868)
