Allow me to further elaborate on some of my failures...
I was fishing on the Right Branch of Young Woman's Creek and the tent caterpillars were everywhere hanging from the trees on threads when I came upon a nice hole with a bunch of fish rising. There was a caterpillar nest directly above so I assumed they were taking Tent Caterpillars. I tried an ancient Chauncey Lively Gypsy Moth pattern I had in my box but there was absolutely no interest...
I guess the fish knew the difference...
Anyway, Sulphurs stated popping off so I switched gears and had a blast but I was POSITIVE I needed a Tent Caterpillar pattern. When I got back home I tied up a black version of the foam Inchworm I swear by and...
...I have never caught a single fish on any of those Tent Caterpillar flies.
I had another epiphany regarding fireflies after ASSuming fish were grabbing them one evening. I created a pattern made of foam with a "light" of yellow Ice Dub. I even went as far as to buy this glow-in-the-dark stuff in a lip balm type tube to enhance the "light."
To date... BUPKIS...!!!
I also tied up several variations of the Little Brook Trout, Little Brown Trout and Little Rainbow Trout flies with subtle differences and marabout tails... They have proved useless although a sac fry version I created with a yellow-orange marabou sac slayed them ONE day on the Letort.
Since then, squat...
2000 years ago when the Ditch was loaded with huge fish, I watched a guy clobbering them with a small red "dung worm" pattern. Hoping to replicate his sucess, I created a version made from dyed violin bow hair (horsehair) * after learning from Vince Marinaro the trick to making it clear before dying by washing it in soap & water.
* This was BEFORE the days of Swannundaze.
The flies came out great and I even created a version with a short red marabou tail but the Ditch fish just chuckled. I later relegated them to bluegill duty where they have proved to be a major success when dangled in front of a suspended "sunnie."
Bottom line, I don't know if it's the flies or the fish but considering I caught trout on an imitation of a french fry behind a McDonald's in Chambersburg, it is kind of hard to understand refusals on lightning bugs, caterpillars, worms and juvenile trout.