Even if the picture were better I don't think a closer ID would be likely. You can send preserved specimens to Dr. Hoffman but I don't know if he IDs small natives or just exotics.
In Washington are only two genera of Polydesmidae known: Polydesmus and Scytonotus.
These two genera looks quite different if you have a better look at them. All species of Polydesmus are introduced from Europe and abundant in urban areas. These species are very familiar to me cause I work with them nearly every day. So determination based on shape, coloration and granulation of the tergites is no problem for me.
If it is a Scytonotus sp. I can't id them further but there are only a few species left.
Rowland Shelley is also familiar with the Northamerican Polydesmids and did great work the last decades on that group. Hoffman were 1950/60 quite active in the american native Polydesmids.
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