This fly has a curious history, and one that I have some slight personal interest in.
The Montana Nymph was introduced to Britain from the US in the mid 1950's.
Lew Oatman showed some samples to Peter Deane & Peter thought them interesting; not least because the original "nymph" had a pair of wings which stood out over the eye.
Peter then thought nothing much of it until he "
introduced the Montana Nymph to a tall, hefty fellow who visited my gallery one day. He was the late David Collyer..." (Peter Deane's Fly Tying 1993)
My father subsequently published an article on it in Angling during the early or mid 1970's.
The first time the fly appeared in a book was in my father's second Fly Dressing book in 1981.
I also have a curious tale to tell about the fly. Despite using it on many occasions, I have only ever caught a solitary fish on the nymph. That was an 8lb 8oz rainbow from Aveley Lakes in about 1987!
Here is the original Lew Oatman dressing:
Silk: black gossamer
Hook: any size long shank or largish standard hook
Tails: black cock hackle fibres or black cock hackle tip, not too long
Body: first 3/5 black chenille
Thorax: yellow chenille
Hackle: black cock - over thorax only
Roof: black chenille
Wings: long slender black rook or crow primary - a pair over eye
and I'm sure the late Mr Deane wouldn't begrudge me reproducing a photograph from his book:
So, by 1981 some changes had occurred. Chinese whispers of the fly dressing world lead to the version my father published in
Fly Dressing II:
Hook: 6-8 long shank
Silk: black
Tail: short dyed black hen hackle
Hackle: black cock over front half of body only
Body: in two halves, black ostrich at rear, yellow chenille at front
Wing cases: ends of black ostrich body material
Horns: two sections from dyed black turkey tail
These "horns" were tied sloping backwards in a more streamlined way.
This brings us to the modern dressing, which seems to have cropped-up during the early to mid 1980's.
I certainly used the lime green fluoro one in the late 1980's.
Here's the modern one, courtesy of yours truly:
Silk: black
Hook: 6-12 long shank
Tail: black cock hackle fibres
Body: black chenille (underbody of lead wire optional)
Thorax: fluorescent lime-green chenille
Thorax cover: black chenille
Hackle: black cock hackle