Where & WhenRegion: West
Time Of Year (?): Summer
To my knowledge, this species has only been described in the scientific literature from the Oregon Cascades. However, on July 25th, I found several swarms of a dozen or so male spinners dancing above a gravel road/trail on the rim of a bouldery canyon at 2800 feet elevation on the eastern slope of the Washington Cascades.
Although this canyon would easily constitute class 4+ whitewater when flows are higher, at typically low summer flows there are lots of quiet backwaters in the pools between the fast drops and boulders. This might be the habitat for the Paraleptophlebia nymphs.
I found them again a couple weeks later on the Middle Fork Snoqualmie River on the west slope of the Washington Cascades.Spinner BehaviorThe male spinners I encountered were flying right at dusk.
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