This specimen resembled several others of around the same size and perhaps the same species, which were pretty common in my February sample from the upper Yakima. Unfortunately, I misplaced the specimen before I could get it under a microscope for a definitive ID.
Taxon on Aug 27, 2006August 27th, 2006, 10:14 am EDT
According to a group of Oregon State University researchers, sublethal level of exposure to pyrethroids (a class of synthetic pesticides derived from naturally occuring chemicals in chrysanthemums) are causing caddisfly larvae to prematurely abandon their cases, and be incapable of rebuilding them with satisfactory substitutes.
Here is a link to the full text of the news release.