Hungerford's crawling water beetle

Hungerford's crawling water beetle (Brychius hungerfordi) is a critically endangered member of the family Haliplidae of water beetles found in northeastern North America. The US Fish and Wildlife Service Draft Recovery Plan for the species published in September 2006 stated that at the time the beetle was only found in 7 streams and was found in small numbers in all but one stream. In 2010, a five-year summary report by the United States Fish and Wildlife Service found the population to be essentially unchanged. In June 2025 the beetle was known to occur in 16 streams range-wide: 14 streams in northern Michigan and 2 streams in Ontario, Canada.

The species was first discovered by entomologist Paul J. Spangler in 1954.