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: "Abdominal sternum
II without chloride epithelium
segment IX with only single seta
on each side of dorsal sclerite
." However, the characteristic "metanotal sa1 sclerites
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.
The only species of Pycnopsyche
documented in Washington state is Pycnopsyche guttifera
, and the colors and markings around the head of this specimen seem to match very well a specimen of that species from Massachusetts on Bugguide
. So I am placing it in that species for now.
Whatever species this is, I photographed another specimen of seemingly the same species
from the same spot a couple months later.