A few of these larger stoneflies were fluttering around the South Fork on an evening dominated by much smaller species.
This one has been difficult to identify. I can't spot any of the gill remnants characteristic of Perlidae
, but the wing venation
seems to point in that direction. I tried keying it out as Perlodidae
but arrived at Isoperla
, every western species of which has significantly smaller bodies than this one.
Edit: See forum comments for a likely correct identification.