This one was surprisingly straightforward to identify. The lack of a sclerite at the base of the lateral hump narrows the field quite a bit, and the other options followed fairly obvious characteristics to Clostoeca, which only has one species, Clostoeca disjuncta.
Doublespey on Jan 10, 2012January 10th, 2012, 5:33 am EST
If I were to make a general statement about when to fish them I would say in the evening time, when the sun starts to get off the water. And I am convinced that Gary L. has to be scrutinized on some of his promotions. I read a good article about a close friend of his that described Gary well. His friend was into helping Gary promote himself in the fly fishing industry, and make a living in the business. Not easy for a small town guy from a small town in Montana. Gary was not about going through the scientific procedures, and, in particular, the extended time it took to prove things as fact. Gary got a lot of mileage out of making provocative assertions that got fly anglers attention, and would thrust him into the limelight. I followed Gary, and his travel/show presentations with his other two business partners, Jack Dennis, and Mike Lawson. His two partners would often just smile when you would mention one of Gary's bug cycle assertions, and the fish's reaction to to these assertions. In my opinion, some proved to be accurate, and some did not. Lawson has designed some effective caddis emergers that I use today that do not include this "halo effect" but do include a sparkle yarn underwing that I use. Who knows for fact?. In my opinion, fish a fly ascending as an emerger, as I do my soft hackles that contain some sparkle in some of my patterns, and the trout react well to them.