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.
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This is the first of it's family I've seen, collected from a tiny, fishless stream in the Cascades. The three species of this genus all live in the Northwest and are predators that primarily eat stonefly nymphs Merritt R.W., Cummins, K.W., and Berg, M.B. (2019).
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Ebony Salmonfly
This common name refers to only one species. Click its scientific name to learn more.
Stonefly Species Pteronarcys princeps
These are pretty much always called Ebony Salmonfly.
This species takes over for Pteronarcys californica at higher altitudes and smaller waters. Because of their habitat preferences, they never achieve the population densities of californica. This and their smaller size are the only differences as they are similar in both appearance and behavior.
References
- Merritt R.W., Cummins, K.W., and Berg, M.B. 2019. An Introduction to the Aquatic Insects of North America (Fifth Edition). Kendall/Hunt Publishing Company.