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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Curved Springflies
This common name refers to only one species. Click its scientific name to learn more.
Stonefly Species Skwala curvata
These are very rarely called Curved Springflies.
This species is virtually identical in appearance to Skwala americana. Telling them apart is usually only possible by comparing genitalia. See the Skwala genus page for detailed information.
This female dropped her eggs just before this photo was snapped. The distinctive notch in the subgenital plate identifies the species. An interesting observation is how active they get when exposed to direct sunlight. Trying to stage this specimen was most difficult. In the shade it would calm right down, but when exposed to direct sun it would immediately go nuts, scampering all over quickly without pause. Perhaps this explains why they don't seem to be found out and about on overcast days, but if the sun peeks out... She was 24 mm long, head to wingtip.