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 wild-looking little thing completely puzzled me. At first I was thinking beetle or month larva, until I got a look at the pictures on the computer screen. I made a couple of incorrect guesses before entomologist Greg Courtney pointed me in the right direction with Psychodidae. He suggested a possible genus of Thornburghiella, but could not rule out some other members of the tribe Pericomini.
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Little Sooty Olives
This common name refers to only one species. Click its scientific name to learn more.
Mayfly Species Serratella serrata
These are pretty much always called Little Sooty Olives.
This locally important species is rarely mentioned in fly fishing literature, and what little information is given is identical to that for Teloganopsis deficiens. Knopp and Cormier say both species can produce good hatches.
References
- Knopp, Malcolm and Robert Cormier. 1997. Mayflies: An Angler's Study of Trout Water Ephemeroptera . The Lyons Press.