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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 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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Stonefly Species Sierracapnia hornigi (Little Snowflies)

Species Range

Physical description

Most physical descriptions on Troutnut are direct or slightly edited quotes from the original scientific sources describing or updating the species, although there may be errors in copying them to this website. Such descriptions aren't always definitive, because species often turn out to be more variable than the original describers observed. In some cases, only a single specimen was described! However, they are useful starting points.

Source: Sierracapnia, A New Genus Of Capniidae (Plecoptera) From Western North America

Male. Tergum 7 knob narrow and slightly notched, knob width 11 - 16 % of segment 7 width (Fig. 8). Epiproct in dorsal view increases in width between neck and anterior half; maximum width 17 - 24 % of epiproct length; maximum width occurs anterior of mid epiproct; apex rounded and with median posterior-projecting triangular lobe; dorsal membrane light colored (Figs. 5, 7). Epiproct in lateral view slightly convex dorsally, deeply keeled ventrally; maximum depth 19 - 24 % of length; maximum depth occurs anterior of mid epiproct; neck narrow (Fig. 6). Epiproct dorsolateral horns closely appressed to main dorsal surface; horn length 15 - 18 % epiproct length; horn tips extend forward to 76 - 85 % epiproct length (Fig. 7, Table 1).

Female. Subgenital plate heavily sclerotized and dark; plate covers full width of sternum 8 from posterior to anterior edge; posterior of sternum 7 sclerotized (Fig. 224, Nelson and Baumann 1989).

Start a Discussion of Sierracapnia hornigi

Stonefly Species Sierracapnia hornigi (Little Snowflies)

Species Range
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