"Green Drake"
Ephemera guttulata
burrowing mayfly nymph
to reveal adult form,
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Largest of
Ephemera flies. 1". Partial to
limestone/chalkstreams of eastern US. Hatches
sporadically beginning in May. Brownish with
mottling. Fished deep along the bottom.
Other
burrowing mayflies:
"Great Olive Winged
Drake" , Great
Brown Drake,
Great Dark Green Drake