Length: barklouse in photo 4.1 mm
Mockford (1993) noted that this species is very similar to X. sommermanae and stated that they may prove to be synonyms. He noted that X. quillayute has been recorded from both eastern and western North America, "primarily on foliage of conifers but occasionally on foliage of broad-leaved trees."
Photo location: Ruraldale, Upshur County, West Virginia.
American Insects site