Mentioned in the book Dan Shields put together of George Harvey's writings, interviews and patterns.
Mr. Harvey tied it in the mid-thirties for the Paradise. Very few people thought to use very small flies and they were very effective. Also fast and cheap to tie, and he would catch trout in front of people and sell them flies. Fox named it the horse collar nymph based on the chenille collar.
Called the Horse Collar Nymph in the book.
Hook: Short Shank # 18 or 20
Original was all black, then he added light olive and white versions.
Body:quill, or floss, or very thin dubbing. For the black version he also lists thread body as an option.
Collar: fine chenille of the same color as the body, although it looks like the collar on the light olive version may have been a darker olive than the body.
The fly photographed for the book has a sparse tail of what looks like hackle fibers of the same color as the body, though no tail is listed in the recipe.
