More Stoneflies...

Building on the recent salmonfly thread. Here are three stoneflies that I photographed last spring. I thought the first two might be Calineuria californica but various sites seem to have conflicting info on those and Hesperoperla pacifica. I thought the one in the third photo was some sort of Isoperla. All were photographed in a coastal Washington river in May/June.

What do you think?

There is only one major difference in the pics of your bug and mine(unless it's just pic angle) that I see. The back antenna thingies are nearly as long as the front ones on my bugs, and the ones on yours don't seem to protrude much past the wing.


Staff member
Hi Thomas-

I believe the 1st to be (Golden Stone) Hesperoperla pacifica, the 2nd to be (Golden Stone) Calineuria californica, and the 3rd to be (Little Green Stone) Sweltsa, of which there are (9) species present in WA.
I had saw stone flies first time..It is beautiful although it can be dangerous also..I have very less information related to it..But I must say nice photography..

Jim Speaker

Active Member
I'm marginally arm-chair at entomology, but if I saw the third one on a stream I'd be thinking yellow sally. And, yep, I've seen variations of the sallies that range from yellow to various shades of green and lime. Are these the same that you speak of Taxon? Or is the one pictured something other than what's commonly referred to as a sally?


Staff member
Hi Jim Speaker-

Are these the same that you speak of Taxon?
Yes. Some members of family Chloroperlidae (Sallflies) tend to be more yellowish than greenish, and flyfishers usually refer to them by the common name, Yellow Sally. Sweltsa is one of those genera of yellowish Sallflies. The Sallfly genera which are greenish are often referred to as Little Green Stoneflies. Hope that helps.

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