Your local fly shop is the best resource for buying the perfect flies for wherever you are fishing. The below illustrations can give you a better idea of why trout flies are designed the way that they are.
Images provided by our friends at Umpqua.
Mayfly Hatch
A)Mayfly Nymph
Gold Ribbed Hare's Ear
B)Mayfly Emerge
Spot Top Emerger
C)Mayfly Adult
Loopwing Paradun
Caddisfly Hatch
A)Caddis Larve
Zwing Caddis
B)Emerging Caddis
Ultralight Emerger
C)Adult Caddis
Elk Hair Caddis
Stonefly Hatch
A)Stonefly Nymph
Sparkle Body Stone
A)Stonefly Nymph
Kaufmanns Stone
B)Stonefly Adult
Stimulator
B)Stonefly Adult
Improved Sofa Pillow
Terrestrials Hatch
A)Ant
Chernobly Ant
B)Flying Ant
Flying Ant
C)Beetle
Foam Beetle
D)Cricket
Dave's Cricket
E)Grasshopper
Dave's Hopper
Midges, Scuds and Leeches
A)Midge Pupa
Chironomid Pupa
B)Scud
Hunchback Scud
C)Leech
Wooly Bugger
D)Adult Midge
CDC Midge Adult
Dragonflies and Damselflies
A)Dragonfly Nymph
Dave's Dragonfly Nymph
B)Dragonfly Adult
Fluttering Dragon Adult
C)Damselfly Nymph
Barr's Damsel
D)Damselfly Adult
Parachute Damsel