The giant Salmonflies of the Western mountains are legendary for their proclivity to elicit consistent dry-fly action and ferocious strikes.
trout loved them either size.
fished Pittsburg, NH, at Back Lake last week for the hex hatch and enjoyed it immensely. the bugs were really big, wings standing perhaps as high as 3 inches off the water, and bodies about as long.
then fished a pond in VT with the same color bugs hatching at the same time in the same manner, but they were about half the size.
different bug? different ecology, therefore smaller?
trout loved them either size.
so similar that distinguishing one from the other requires microscopic examination of the genitalia of a male imago
vary in body length from ~12 mm to ~37 mm