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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With a bit of help from the microscope, this specimen keys clearly and unsurprisingly to Hydropsyche.
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Definition of 'costal crossvein'
Definition of 'costal crossvein'
Costal crossvein: Crossveins in between the leading edge of the wing and the first longitudinal vein inside the wing, i.e. between the costa and subcosta. Some older sources may simply refer to them as "costals."
These other words reference the same concept: costal crossveins, costal crossvein, costal crossveins, costal cross veins, costal cross veins, costals, costals.
These other words reference the same concept: costal crossveins, costal crossvein, costal crossveins, costal cross veins, costal cross veins, costals, costals.