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Lateral view of a Male Baetis (Baetidae) (Blue-Winged Olive) Mayfly Dun from Mystery Creek #43 in New York
Blue-winged Olives

Tiny Baetis mayflies are perhaps the most commonly encountered and imitated by anglers on all American trout streams due to their great abundance, widespread distribution, and trout-friendly emergence habits.

Ventral view of a Hydropsyche (Hydropsychidae) (Spotted Sedge) Caddisfly Larva from the Yakima River in Washington
With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
27" brown trout, my largest ever. It was the sub-dominant fish in its pool. After this, I hooked the bigger one, but I couldn't land it.
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Jman has attached this picture to aid in identification. The message is below.
Mid Missouri

Posts: 4
Jman on Jun 6, 2008June 6th, 2008, 5:31 am EDT
Greetings, I have a question for someone I found this one on my screen door last night and I have searched to try and come up with a name to put with it. I have tied flies for a few years but I've just duplicated patterns found in books or fly shops. I've never tried to identify the insects I have been tying, until now. By the way this mayfly is from Mid Missouri.
Wiflyfisher's profile picture

Posts: 622
Wiflyfisher on Jun 6, 2008June 6th, 2008, 6:55 am EDT
My guess is an Epeorus spinner. It is somewhat difficult to tell because some of the essential keys are missing. :-)

(Keys - I mean like number of tails.)
Mid Missouri

Posts: 4
Jman on Jun 6, 2008June 6th, 2008, 8:25 am EDT
I believe there were 2 tails - right before my 3 year old needed to hold him...

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