Himalopsyche phryganea (Ross, 1941) - Himalopsyche phryganea
Mill Creek, Humboldt County, California, USA
February 27, 2017
Size: ~24 mm
Specimen collected 17-VII-2002. This species rarely shows up in bioassessment samples probably because it hangs out in small, torrential streams that don't get sampled regularly. The larvae are distinctive by size and the large, dense tufts of gills on the thorax and abdomen. Larvae of several Rhyacophila species groups also have gills, but never in such dense tufts. I've caught a handful of adults over the years in black light traps. The adults look like very large Rhyacophila. It's always a treat to run across either larvae or adults of this species.
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