There was a discussion a few months ago concerning tying "caterpillars" . I came across this thread this morning on FLYTYINGFORUM.COM. Scrolling down under REALISTIC FLIES, look up "simple caterpillar, step by step." This is a simple enough tie to be classified as a "Guide Fly". As one who believes, terrestrials are an extremely important food source for Smokies trout, I'll be tying a number of these.