These are larger (to about 8 mm) and glossier than another species that I seem to see fairly regularly down by the stream in my backyard. The closer I am to the water, the more likely they are to appear. No sand, just muddy substrate and they are more associated it seems with wood that is in contact with soil. They are fast moving/evasive and with irregular-looking movements, and difficult to catch compared with Porcellio or Oniscus. They are softer-bodied. I am not particular proud of this series of photos, but I am particularly interested in knowing who they are! The second image in this series more approximates the coloration as seen by the naked eye.