Subject: Freshwater bug
Geographic location of the bug: East Kootenay, British Columbia
Time: 10:44 PM EDT
Your letter to the bugman: Found this insect floating in a freshwater lake in late May.
6 legs, approximately 2” long.
Found another smaller specimen the next day.
Suspect type of dragon fly larva but never seen one with these mouth appendages
How you want your letter signed: David
This is a Water Tiger, the predatory larva of a Predaceous Diving Beetle. It breathes air through a siphon at the tip of its abdomen which is why you found it floating. Here is a BugGuide image for comparison.