It was about 8 years ago that I saw my first Predacious Diving Beetle (Tiger Beetle) in the stomach of a large trout and had no idea what it was but saved it and showed it to Brian Chan and he told me. Scary creatures for sure!They are also known as "Toe Biter" - for reasons which become apparent when you have a close look at their piercing mouth parts!
The first one I ran across had those parts buried deep in a 2 1/2'' long dragonfly nymph (which up until then I had thought was the top insect predator in our local lakes) and was busy draining the last of it's enzyme digested innards.
A week later I saw my first predatious diving beetle and realized there are some big, ugly monsters living in our waters! I wonder if they are ever taken by larger trout, or if they would just be more trouble than they are worth?