The Amphizoidae is a small family of predaceous beetles whose larvae and adults live on submerged rocks and debris in fast-flowing streams. All are in the genus Amphizoa LeConte. In North America amphizoids are restricted to the western states and provinces from Alaska south to southern California and east to central Wyoming and Colorado. Two species occur in China (one from a region formerly part of Tibet). Kavanaugh (1986) recently revised the family, although Edwards (1951) still provides much useful information. Edwards (1954) discusses the biology of the family.
Edwards, J. G.