I had some trouble working through the genus key for this one because I'm not great at interpreting caddis wing venation
. Fortunately, figure 19.707 in An Introduction to the Aquatic Insects of North America (Fifth Edition)
shows the distinctive color pattern of the striking forewings
on Hydatophylax argus
, which is a perfect match for the pattern as well as venation
. As there are no other species in that genus in this area, I can be pretty confident in the species ID.