Pteronarcys californica AKA Salmonfly
The large detritivore nymph is ubiquitous on some western rivers - making the plump nymph a must to carry in your box. The Adult however, at around 2" or 5cm in length, is an almost birdlike insect noticeable from great distances as they pulse thru the air. Add to the size, the trout preference for gobbling up these large insects and dry fly fishing can not get much better.
We say much because tossing big mouse patterns for Alaskan Rainbows or Oregon Browns is realllly hard to top. Rainy's top shelf flies are superb in both construction and materials. The overall look and tie quality simply can't be beat.