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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
Baetis

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 Holocentropus (Polycentropodidae) Caddisfly Larva from the Yakima River in Washington
This one seems to tentatively key to Holocentropus, although I can't make out the anal spines in Couplet 7 of the Key to Genera of Polycentropodidae Larvae nor the dark bands in Couplet 4 of the Key to Genera of Polycentropodidae Larvae, making me wonder if I went wrong somewhere in keying it out. I don't see where that could have happened, though. It might also be that it's a very immature larva and doesn't possess all the identifying characteristics in the key yet. If Holocentropus is correct, then Holocentropus flavus and Holocentropus interruptus are the two likely possibilities based on range, but I was not able to find a description of their larvae.
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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Byhaugh
Hawaii

Posts: 56
Byhaugh on Apr 22, 2014April 22nd, 2014, 11:58 am EDT
This is the photo.
Thanks!

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Byhaugh
Hawaii

Posts: 56
Byhaugh on Apr 23, 2014April 23rd, 2014, 10:11 am EDT
Sorry,
I know it would help to have a better photo, but this is the best I can do.
Surely someone can suggest an identification?

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Taxon
Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Apr 23, 2014April 23rd, 2014, 1:31 pm EDT
Hi Mack,

Although I also believe to be of family Baetidae, it doesn't have the hind wing profile I would associate with it being of genus Callibaetis.
Best regards,
Roger Rohrbeck
www.FlyfishingEntomology.com
Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Apr 23, 2014April 23rd, 2014, 6:02 pm EDT
Roger is right, IMO. Where & when was this fly collected? Size?
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Byhaugh
Hawaii

Posts: 56
Byhaugh on Apr 24, 2014April 24th, 2014, 5:22 am EDT
Here is another (better) picture


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Entoman
Entoman's profile picture
Northern CA & ID

Posts: 2604
Entoman on Apr 24, 2014April 24th, 2014, 3:44 pm EDT
Hi Byron,

The latest photo is of a mayfly in an entirely different family from your first one. Do you have answers to my questions posted above?
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman
Byhaugh
Hawaii

Posts: 56
Byhaugh on Apr 24, 2014April 24th, 2014, 4:45 pm EDT
Ento,
I know, but it also is up for identification. Pic. Is a mayfly from Argentina.
Given its speckled nature and that it is from a lake I thought Calibaetis. But it has large hind wings. Could it be related to the Calibaetis??
Thanks

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