Butter Worms or Trevo Worms
Butterworms
You will be hard pressed to find these in the tackle shops, but they are worth every penny. Not to long ago a couple friends of mine land 40 fish in a couple hours on butters, when fishing in just on hole.
Wax Worms
Wax worms are the soft bodied fat grubs of the Galleria mellonella moth. Easy to store and fairly easy to find at most bait shops or pet stores. Waxies are another smoking bait on the West Branch of the Delaware. Excellent in low flows or when a more finessful presentation is needed. Waxies are particularly useful when scum covers the bottom of the river, as they float. Small hooks and a proper shot pattern will cause waxies to hover just above the bottom and right at feeding level. Think of a wax worm as the caddis on crack.Crickets

The catching of aquatic insects is illegal on NY trout streams, however stoneflies are simply irritable to West Branch trout. Crickets minus the rear legs are a legal and easy substitute for stoneflies.
Mealworms
Mealworms are the larval form of the mealworm beetle, Tenebrio molitor, a species of darkling beetle. Mealworms are the most
available of the insects in the bait shops and easiest stored. Mealworms are not the best bait going but in a pinch they work well.