DYTISCIDAE AND NOTERIDAE OF WISCONSIN (COLEOPTERA) .3. DISTRIBUTION, HABITAT, LIFE-CYCLE, AND IDENTIFICATION OF SPECIES OF COLYMBETINAE, EXCEPT AGABINI

Nineteen species of Colymbetinae, excluding Agabini, were collected in Wisconsin over the past 30 years. Included are three species of Colym betes, two species of Copelatus, three species of Coptotomus, two spec ies of Matus, two species of Neoscutopterus, and seven species of Rhan tus. Species keys are provided for adults, but larvae are poorly known and species keys are provided only for larvae of Matus and Neoscutopt erus. Information on distribution and abundance in Wisconsin, habitat, life cycle, and identification is provided for each species based on a study of 9,857 adults and 834 larvae. Most species had univoltine li fe cycles, with adults overwintering and larvae developing mostly in s pring and early summer. A partial late summer generation occurred occa sionally some species of Coptotomus, Matus, and Rhantus. Adults overwi ntered in aquatic habitats, except those of five species of Rhantus th at overwintered in terrestrial sites. Both species of Neoscutopterus h ad semivoltine life cycles, with adults and larvae overwintering.