There are a little over 250 species of water scavenger beetles in the US. These beetles, as their name implies, live in aquatic habitats. They are able to “breathe” in the water because they keep their an air bubble in place underneath their bellies by a pile of hair on their underside; this often gives them a silvery appearance. The name of “scavenger” is somewhat of a misnomer; some adults feed on insects and plants and the larvae are always predaceous.
They lay their eggs in damp places one at a time, in pairs, or in clusters. Some females carry their eggs in masses attached to their abdomen. The egg cases are distinctive and can be used to identify the genera.
These beetles overwinter as adults.