Entoman on Feb 19, 2014February 19th, 2014, 3:33 pm EST
Hi Byron -
The Salmonfly is much larger. While some strains of Hex females can approach 40mm body length and some strains of Salmonfly males can be in the 30mm range, the latter are still substantially bulkier. With more typical strains and with gender differences aside those length ratios are reversed making the size difference even more dramatic.
"It's not that I find fishing so important, it's just that I find all other endeavors of Man equally unimportant... And not nearly as much fun!" Robert Traver, Anatomy of a Fisherman