Quote Originally Posted by Byron haugh View Post
An Elk Hair Caddis is an adult caddis - fully emerged.

A Sparkle Dun represents the inhibited emergence of a mayfly - in this case, a PMD. The shuck of the PMD is darker than the fully emerged sub-imago. That is why I have the darker trailing shuck and the rear abdomen.
Byron,
The "E/C Caddis" isn't an elk hair caddis. E/C = emergent/cripple, and the two tone body of the E/C is for the same reason you described on your PMD above.