Hydrobius melaenus
- kingdom: Animalia
- phylum: Arthropoda
- class: Insecta
- order: Coleoptera
- family: Hydrophilidae
- genus: Hydrobius
- species: Hydrobius melaenus
Emerson- Hillsdale
- River Vale
- Westwood
New Jersey- Cayuga Heights
- East Ithaca
- Ithaca
- Northeast Ithaca
New York- Washington, D. C.
Washington, D.C.
United States