Are you thinking of the Bill Scheiss pattern? If so, probably easiest to just drop him a line: http://www.bsflies.com/guides.htm.

At least one reference I found said it was just mohair:

Mohair-Marabou Leech ("California Leech")
Hook: 3XL, No. 2-10
Tail: marabou fibers with a few strands of Krystal Flash
Underbody: Kystal Flash
Body: Mohair, sparse and combed out
Colors: brown, black, olive, wine
Originator: Bill Schiess
(source)