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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 Kogotus (Perlodidae) Stonefly Nymph from Mystery Creek #199 in Washington
This one pretty clearly keys to Kogotus, but it also looks fairly different from specimens I caught in the same creek about a month later in the year. With only one species of the genus known in Washington, I'm not sure about the answer to this ID.
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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By Bnewell on July 18th, 2012, 9:27 am EDT
This stonefly is one that is fairly common in higher altitude lakes, especially in western North America. I have collected it in higher lakes in Glacier National Park, Montana. Dick Baumann tells me that in a recent publication this stonefly has been renamed Skwala compacta.

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Taxon's profile picture
Site Editor
Plano, TX

Posts: 1311
Taxon on Jul 19, 2012July 19th, 2012, 7:45 pm EDT
Hi Bob,

When checking out Skwala compacta, I noticed that the Valid Stonefly Names for North America list maintained by Ed DeWalt has not been updated since 3/19/2009. Do you have any insight into why that might be?
Best regards,
Roger Rohrbeck

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