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Photo#799461
We're thinking this might be flammeusella - Adela flammeusella

We're thinking this might be flammeusella - Adela flammeusella
Oregon Rt 3, Paradise, Wallowa County, Oregon, USA
June 16, 2013
One of two more individuals of what we think are the Adela.

If you google it, you will see that Paradise
is just barely in Oregon. We were about 4 miles south of Washington and maybe ten miles west of the Snake River and Idaho. It is way up in Northeast Oregon. Looking forward to seeing more of these the next time we visit.

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I agree, appears to be Adela flammeusella
Here are details:

The eyes appear not to reach the crown of head, and to have diameter much less than 2 times the distance between the eyes (measured at top of head). That indicates this is a female.

So, using the key in Powell(1), this goes to either A. flammeusella or A. thorpella. Females of those two species are separated in the key by the ratio of antenna-to-forewing length: 1.5-2.1 for flammeusella vs. 1.3 or less for A. thorpella. I measured the antenna here to be more than 1.5 times the forewing length...and correcting for foreshortening due to perspective would likely yield an increase for the actual antenna length over that measured in the plane of the photo.

Moreover, the pattern of white spots on your moth is definitely consistent with A. flammeusella (see ♀ in Plate 2.1 from Powell & Opler(2)). Although the white spots of A. thorpella can be similar in number and position, I believe they're usually smaller and/or fainter. (But Powell indicates the spots can be reduced in both species.)

Also the discussion in Powell(1) indicates flammeusella has a dark apical wing fringe as in your photo, while thorpella has a white fringe (see here for latter...and by the way, the wing fringe here looks dark, hhmm?).

Furthermore, whereas Powell(3) gives only CA records for thopella, the range for flammeusella is given as:

"Southern Washington (Columbia River), southward (although records are lacking for Oregon) through foothills and interior valleys of most of cismontate California, mostly below 2000'  "
Your post presumably provides a record in the "Oregon gap".

Finally, it's good to have some posts of females. (Previously we only had one post of a female A. flammeusella...and that one has quite reduced white spots (virtually nil) and a light wing fringe...which despite my comment below that post, still makes me wonder if it may be a thorpella with anomalously long antennae.)

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