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The Light Hendrickson pattern is commonly used for two other mayfly hatches. The Ephemerella invaria can also be called Pale evening Dun or Sulphur and is commonly mistaken with
Ephemerella dorithea. But
invaria hatches first, often right after
subvaria or Dark Hendrickson. It is more robust than
later Pale Evening Dun or Sulphur patterns. For most fly angler’s however, it is enough to remember Dark Hendrickson first then Light Hendrickson second. Once in a great while angler’s will not have any luck on rising trout hitting
Dark Hendrickson, even though it is only
subvaria that is out. Perhaps
trout are keying only on females, for whatever reason switching to
Light Hendrickson seems to do
trick.
One other thing about
Light and Dark Hendrickson fly patterns. Is that they make great general all-purpose mayfly attractor patterns. Renowned fly fishing author Skip Morris, has proposed that only two mayfly patterns are required in one’s arsenal a dark and light pattern. While most angler’s wouldn’t be comfortable with such a limited offering, these two patterns would complement each other just fine. The Dark Hendrickson is second only to
Adams as
most used all purpose mayfly attractor.
Let’s also not forget
sub-surface version of these great trout mayflies. The common three patterns that cover
whole Hendrickson family of may flies are as follows. Of course there is
Hendrickson Nymph, which is a close cousin of
all-time great Mayfly nymph
Hare’s Ear, and then
more dainty Pheasant Tail.
The Hendrickson’s, whichever Mayfly is on
water, are a versatile combination to have in your possession. They can be traced back to when affluent fly fisher’s had their own tier’s, and they are still used today. Classics never go out of style.

Cameron Larsen is a retired commericial fly tier and guide. He now operates The Big Y Fly Co. www.bigyflyco.com