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.
Subcosta: The subcosta (denoted Sc) is the second major longitudinal wing vein, located behind the costa, which it usually closely parallels along the leading edge of a mayfly’s forewing. It is a furrow vein (–).
These other words reference the same concept: subcosta, subcostal, subcostal vein, vein Sc, Sc, Sc.
