(Price for 12 Flies) The Zug Bug Nymph fly pattern is thought to be a variation of a nymph called the kemp bug. In the mid 1900’s it became very popular and spread to the mountainous regions of Western America. It was used successfully in Yellowstone National Park and the Sierra Nevada. It rates along with Pheasant Tail nymphs, Gold Ribbed Hare’s Ear nymphs and Prince’s nymph as one of the top 10 nymphs that you must have in your fly box. It is one of those must have flies.