Czech Nymphs have thin Abdomen & Thorax. The weight should be flatten to ribbon shape, from the tube shape. The reason for this is thinner weight wraps, and less thread wraps to secure weight wraps (thread will not slip between wraps, as it does if weight remained tube shaped).
Shrimp/Scud hook is used.
Easy does it with the dubbing, dubbing should be sparse to a gossamer consistency before applying to thread.
Two tone the body, abdomen lighter shade of dubbing, then thorax.
Clear Shell-back, with Sharpie Pen to color over Thorax portion of Shell-back. Use Color of wing for sharpie pen color of shell-back over thorax area (reference to pattern recipe further down in this posting).
Thin wire or very small diameter tippet material for ribbing. Which end as the front of the Abdomen.
You can add a “Hot Spot” between the Abdomen and Thorax, if you wish to (red yellow, orange).
Since these Czech Nymphs are suppose to represent Caddisflies, the body size and coloration, should be appropriate to the specie of adult caddisfly it represents
[url=http://www.flyanglersonline.com/bb/viewtopic.php?t=13723:b60fd](see Czech Nymphs & Net Spinning Caddis)[/url:b60fd] for family name size and separate posting regarding recipes at bottom of postings, that I posted.
Weight wrap starts 2/3 back on the hook shank, wrapped forward, then reversed half way on the weight wrap. This will give the dressed hook a perfect balance for presentation in the water. The weight wrap will also aid the constructing the proper taper to the flies body shape.
Use an example from the recipe on the referred to posting, in regards to the Green Caddisfly dry fly recipe.
Green Czech Nymph
Hook: Shrimp/Scud, #14,#16,#18.
Weight: Flatten non-lead weight.
Thread: Black, 8/0.
Ribbing: 0.006 tippet.
Shell-back: Clear strip.
Abdomen: Medium Olive Green dubbing.
Hot Spot: Yellow, Red, or Orange dubbing (Optional).
Thorax: Olive Green dubbing.
Wing-case (portion over thorax): Brown.
Hackle: Brown (brown hen or brown partridge).
Tying tip: You can reduce bulk, by tying in the scud-back at the beginning, and use the material to secure the ribbon weight wrap to the hook, secure at the rear, and use later for the shell back.
The only problem I have with the Czech Nymph Fly, is the name. Caddis are never “Nypmh’s”! They are either Larva (worm), Pupa, or Adult! That is why they referred to as “Caddisflies”, not
Caddis Flies"!