Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.
It's only barely visible in one of my pictures, but I confirmed under the microscope that this one has a prosternal horn and the antennae are mid-way between the eyes and front of the head capsule.
I'm calling this one Pycnopsyche, but it's a bit perplexing. It seems to key definitively to at least Couplet 8 of the Key to Genera of Limnephilidae Larvae. That narrows it down to three genera, and the case seems wrong for the other two. The case looks right for Pycnopsyche, and it fits one of the key characteristics: "Abdominalsternum II without chloride epithelium and abdominal segment IX with only single seta on each side of dorsalsclerite." However, the characteristic "metanotal sa1sclerites not fused, although often contiguous" does not seem to fit well. Those sclerites sure look fused to me, although I can make out a thin groove in the touching halves in the anterior half under the microscope. Perhaps this is a regional variation.
On Sunday July 28th, I drove 2-3 hours each way (traffic got crazy) to spend about 3 hours fishing and sampling bugs in a favorite small stream on the east side of the Cascades, where a meadow in the middle of a hot burn from a few years ago has produced surprisingly large (meaning up to 10") and spectacularly colorful Westslope Cutthroat Trout. It could almost be called a spring creek, at least in the meadow reaches, although the same clear, stable, spring-fed water tumbles through a rocky forest for most of its length.
It is by far the smallest stream I routinely fish, and sometimes it's so narrow the grass overlaps the water from both sides and leaves nowhere to cast. With the combination of close quarters, tight spaces, clear water, and bright sun, it was a real challenge to sneak up on fish and present a fly without spooking them.
Every once in a while it opens up to a "large pool" like this one, which held the biggest fish of the day (about 8.5").
The larger fish I've caught previously were either hiding under the cut banks for the day or living in bigger water downstream. It's possible I've seen them up this high in the past because I fished it about a month earlier and they were up there spawning. I explored the forested reach below for just a little while and caught one still in spawning colors.
I was as interested in bug collecting on this trip as in the fish themselves, because I figured the altitude (around 5,000 feet) and spring-fed nature of the system might offer something new to find. It didn't disappoint. By far the most abundant large nymphs in my kicknet sample were Drunella coloradensis, and I collected my first adults of this species as well.
Among the dozens of nymphs of that species, I found a single specimen of a really unique-looking mayfly nymph that got me excited, the ultra-spiky Drunella spinifera:
I also collected my first adult of the extremely common caddisfly genus Rhyacophila.
And sweeping around the grass overhanging the stream turned up a few specimens of Dolichopodidae, or Longlegged Flies.
