Hydrocampinae, [421]

Hydrocores, [562]

Hydrocorisae, [562]

Hydrocyphon deflexicollis, [255]

Hydrometra, [552];

H. stagnorum, [551]

Hydrometridae, [551]

Hydrophilidae, [216] f.

Hydrophilides, [219]

Hydrophilus piceus, [217]