Predaceous diving beetle

#5633  Hello, Hoping to identify this bug please. caught April 1, 2016 at dusk (about 8:30pm) west edge of Calgary, Ab.   Canadian quarter for scale.  Cat caught it in garden mulch near coniferous trees.  Thank you, Carol

This is a predaceous diving beetle (Coleoptera: Dytiscidae); likely in the genus Dytiscus. These beetles (and their larvae, ‘water tigers’) are general predators on other small aquatic life forms. They also are excellent fliers, and may be found quit  some distance from any water. Ed Saugstad, retired entomologist; Sinks Grove, WV.