Pale yellow stonefly. 5/8ths".
Hatches in July & August,
primarily at twilight on warm
evenings. Principally found in swift
rivers of Wyoming & Montana. Often
mixes with Little Olive Stoneflies.
"Western Yellow
Stonefly"
Isoperla marmona
stonefly nymph
Pale yellow stonefly. 5/8ths".
Hatches in July & August,
primarily at twilight on warm
evenings. Principally found in swift
rivers of Wyoming & Montana. Often
mixes with Little Olive Stoneflies.