New distributional data for the northern forestfly, Lednia borealis Baumann and Kondratieff, 2010 (Plecoptera: Nemouridae), Washington, USA

The northern forestfly, Lednia borealis (Plecoptera: Nemouridae) is a rare montane stonefly believed to be endemic to Washington. The species, first recognized as a valid taxon in 2010, is the only member of the genus Lednia known from the state. Like other species in its genus, it is found in mid- to high-elevation cold water habitat, including lakes, glacial-fed streams, and rheocrenes (channelized springs). Lednia species in general appear to be rare or at least rarely collected. Because of their reliance on alpine and subalpine habitat, Lednia may be especially vulnerable to threats associated with climate change. However, relatively little is known about this species, and distribution data are scarce. From 2015 to 2019, 94 sites were surveyed in order to document unmapped populations of Lednia borealis to improve range and distributional information from montane areas of Washington State. In this paper, we share locations of L. borealis documented to date, including collections from eight newly documented Lednia sites in the Mt. Baker and Glacier Peak Wildernesses in the Cascade Mountains of Washington, and report recent COI barcoding results. We also provide updated details on the species’ distribution, highlight a confirmed habitat association with glacial edge meltwater, and provide recommendations for future surveys. ### Competing Interest Statement The authors have declared no competing interest.