The March Brown (Rithrogena germanica)
and Late or False March Brown (Ecdyonurus venosus).
To all intents and fly dressing purposes, these are the same fly.
March Brown Nymph - Dict. of Trout Flies 2nd ed.;
A. Courtney Williams - page 231.
Hook: Size 13.
Whisks: Two short strands of cock pheasant tail.
Body: Herl of cock pheasant tail.
Ribbing: Fine gold wire.
Thorax: Bunch of hare's ear at shoulder.
Legs: Partridge light brown feather.
March Brown Nymph (John Veniard )
Hook: 12 - 14.
Tail: Two strands of cock pheasant tail fibres,
or brown mallard shoulder feather fibres.
Body: Cock pheasant tail.
Rib: Gold wire.
Thorax: Hare's ear fur.
Wing-case: Woodcock wing feather fibres.
Legs: Small brown speckled partridge hackle.
March Brown Nymph (Clyde style)
Whisks: Two or three strands from marled cock pheasant tail.
Body: Dark hare lug spun on orange tying silk.
Rib: Fine gold wire.
Thorax: Dark hare lug.
Hackle: Dark partridge trimmed to a suitable length.
Personally I do not agree with trimming hackle.
Wing-cases: From secondary wing feather of hen pheasant,
coloured side out.
Hackle: Dark partridge.
Hooks: Immature - 16,18.
Mature - 12,14.