Quote Originally Posted by fritz View Post
this imitates an Isonychia nymph prevalent here in the northeast. very effective I might add

http://midcurrent.com/tying-vinnies-isonychia-nymph/
+1 fritz has it right... it's a nymph for a Isonychia or Mahogany Dun Mayfly... see more here:

http://www.troutnut.com/hatch/649/Mayfly-Isonychia-bicolor-Mahogany-Dun