The famous nocturnal Hex hatch of the Midwest (and a few other lucky locations) stirs to the surface mythically large brown trout that only touch streamers for the rest of the year.
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
Welcome to the forum. That is a nymph from an intirely different family. It is an ephemerellid, probably in the genus Ephemerella.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
It is absolutely not a Hendrickson. If you Google "Hendrickson nymph images" or "Ephemerella subvaria images" you will get a hit with tons of high quality pictures of the insect in question.
Here is a link that shows color variations among two nymphs of the same genus. The light colored nymph of dorothea does resemble your nymph picture. However I'm not a bug guy, just an avid fly fisher, so I don't differentiate very astutely about how many tails or how their sex organs look under a microscope because the trout don't really care.
I think you're on the right track, Mack. Nice explanation about the synonymy.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Yeah, I was thinking about the possibility of the carolina form since synonymized with serrata. The prominent tubercles on the abdominal segs (particularly the ninth) and southern location got me to speculate, but the more I thought about it the more the idea seemed unlikely.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
This isn't E. dorothea dorothea though. That species doesn't have tubercles projecting beyond the posterior edges of the abdominal segments.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
BTW, it is a Sulfur Higherroad. If no other reason than it happens to be sulfur colored. ;) I can't imagine the dun being any other color from this nymph. The Sulfurs up in Spence's country are green (remember that one you posted a few years back that fooled me?). These ephemerellids are all over the color wheel, even in the same species.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman