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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.

Dorsal view of a Epeorus albertae (Heptageniidae) (Pink Lady) Mayfly Nymph from the East Fork Issaquah Creek in Washington
This specimen keys to the Epeorus albertae group of species. Of the five species in that group, the two known in Washington state are Epeorus albertae and Epeorus dulciana. Of the two, albertae has been collected in vastly more locations in Washington than dulciana, suggesting it is far more common. On that basis alone I'm tentatively putting this nymph in albertae, with the large caveat that there's no real information to rule out dulciana.
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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Calloway has attached this picture to aid in identification. The message is below.
Asheville, NC

Posts: 5
Calloway on Jul 9, 2008July 9th, 2008, 7:32 am EDT
Got some guys wanting to say the following is a Hex Limbata. I'm not sure what it is but a little light in color for the Hex's I am familar with. Would like to say golden Drake but only two tails.

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"Bear Swamp," PA

Posts: 1681
GONZO on Jul 9, 2008July 9th, 2008, 9:28 am EDT

This is Hexagenia limbata. That species displays tremendous variation in appearance over its transcontinental range. Sometimes the observed differences are due to this variation, sometimes they are due to the difference in coloration between male and female, and sometimes they are attributable to capturing the insect at various stages of darkening following a molt. Teneral (freshly emerged) insects will be much paler and will have less distinct markings than those that have had time to age and darken. This is true of nymphs, duns, and spinners. Your mayfly is a female imago (spinner) that has yet to express her egg packets.
Wiflyfisher's profile picture

Posts: 622
Wiflyfisher on Jul 9, 2008July 9th, 2008, 9:56 am EDT
To add to what Gonzo is saying, see the photo below of two Hexs I captured this year...

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