Sulfur nymph vs March Brown
I am tying some sulfurs for early may here in PA. I was told by the local fly shop that with the cold weather we have been having, the hatch will probably be delayed and march browns are more likely at this time period. When i look at pictures of the actual nymphs they look very similar... What is the key feature on them that you think sets the fish off as to which is which or will my sulfur pass as either? I used yellow PT, black thin skin, a brown dubbing for the thorax, and partridge for legs.
The key feature for the sulfur was the 1/2 dark wingcase but what for the MB?
Thanks in advance,