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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 Setvena wahkeena (Perlodidae) (Wahkeena Springfly) Stonefly Nymph from Mystery Creek #199 in Washington
As far as I can tell, this species has only previously been reported from one site in Oregon along the Columbia gorge. However, the key characteristics are fairly unmistakable in all except for one minor detail:
— 4 small yellow spots on frons visible in photos
— Narrow occipital spinule row curves forward (but doesn’t quite meet on stem of ecdysial suture, as it's supposed to in this species)
— Short spinules on anterior margin of front legs
— Short rposterior row of blunt spinules on abdominal tergae, rather than elongated spinules dorsally
I caught several of these mature nymphs in the fishless, tiny headwaters of a creek high in the Wenatchee Mountains.
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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You can create new topics in this section from each hatch's page in the insect section.
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13
Jun 11, 2019
by Sapperstyle
Dobson Fly [Page: 1, 2]
Jun 23, 2011 by Jesse in genus Corydalus
26
Sep 12, 2013
by PaulRoberts
56
Aug 23, 2013
by Trout_House
5
Jun 28, 2011
by PaulRoberts
trying to figure out
Apr 19, 2009 by Buggy in family Corydalidae
1
Apr 19, 2009
by GONZO
7
Jul 3, 2008
by Shawnny3
2
Mar 10, 2008
by Joec
2
Jul 22, 2007
by GONZO
Hellgrammite hell
Jun 5, 2007 by Sprattoo in genus Corydalus
1
Jun 5, 2007
by Wiflyfisher
1
Mar 10, 2007
by Troutnut
Warm Winter Bugs
Jan 2, 2007 by CaseyP in family Corydalidae
15
Jan 19, 2007
by Martinlf
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