Predaceous diving beetle

6320 I found this beetle on my deck and was shocked to see it! Never seen one so big around here! I looked at some pics but could not identify it! Was hoping you could. We are on an acreage south of Saskatoon SK. Thanks. From Saskatoon.

Number 6320 This is a predaceous diving beetle (Coleoptera: Dytiscidae). They and their larvae (often called water tigers) are general predators on other small aquatic life forms, mainly other insects. They also are strong flies and may be found at quite some distance from water.