Lastchance,
As I mentioned in the original post, the E/C Caddis stands for "Emergent/Cripple" Caddis......meaning it hasn't completely gotten rid of its exoskeletal shuck. I believe that when an emerging Caddis gets stuck in its shuck in the surface film, there is a color difference in the thorax as opposed to the abdomen trapped in the shuck.
By the way, where did "Lastchance" come from? Happens to be my favorite spot: Last Chance, Idaho..........home of the Henry's Fork......technically part of Island Park, Idaho.
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