Mine looks more heavily marked than the image you provided. A shared feature amongst mine was the light silvery rectangular patch top central on the folded wings. It really showed up from a distance.
Yes, I was comparing to your top photo. Though darker (& hence more obvious), compare them cell by cell and the spotting pattern is remarkably similar. I'd like to hear Dave's thoughts on the possibility that the pinned specimen has bleached out.
They were variable in size (16 to 14)
So the critter from head to wingtip was under 10mm? That sounds a little small for brunnea
, I think. But even if it weren't, there's a reason Dave answered "Nope" to your question of I.D. possibility. There are at least 17 species in CO, probably more. I know that Dave co-authored a paper on distribution of Colorado species awhile back, so he can obviously give a more accurate count. Anyway, the point is we can rule many species out, but there's a whole bunch we can't so to attempt an I.D. from a photo beyond genus at this point is probably just pure speculation. Fun, though!:)
BTW - if you look for brunnea
in LaFontaine, you won't find it as it's listed under its synonym R. acropedes
, which I believe is the critter you are referring to.