This version of the Montana Pheasant Tail has a Fluo Lime Micro UV Straggle Fritz Thorax , the original used a standard chenille thorax. The tying for both patterns is very much the same.
STEP 1 : Run the thread from near the eye down around the hook bend, catching in some silver wire as you go.
STEP 2 : Just above where the thread stops on the hook bend, catch in a bunch of pheasant tail fibres as shown, these will become the tail of the fly.
STEP 3 : Now take the thread back to a position just over half way up the hook shank then return the thread back down and up again until the hook is covered and a uniform body is created. Return the thread to a position just in from of the pheasant tail ends. (Do not snip the pheasant tail ends, these will be used for the thorax cover).
STEP 4 : Wind the wire up the hook shank creating an evenly spaced rib. Secure with thread just in front of the pheasant tail ends and remove waste wire. (Rock the wire back and forth until it snaps).
STEP 5 : Catch in a black cock hackle.
STEP 6 : Catch in a length of Fluo Lime Micro UV Straggle Fritz and return the thread to the eye.
STEP 7 : Wind the Micro UV Straggle Fritz up the hook shank until you reach the eye and tie off with thread. (After each wind of the straggle fritz, brush the fibres back with your finger so they aren't trapped in the winding, wet your fingers if necessary).
STEP 8 : Now perform three windings of the cock hackle around the thorax, try not to catch too many straggle frtiz fibres in this process.
STEP 9 : Now snip away with scissors any hackle fibres that protrude above the thorax
Final : Finally, pull the pheasant tail ends over the thorax and secure at the eye with thread. Trim the ends, create a neat head, whip finish and cut away the thread. Varnish the head as required.
Here's a version of the Montana Pheasant Tail Nymph tied with a chenille thorax.