Tan X Caddis Emerging Caddis Adult Trout Dry Fly - 6 Flies Hook Size 18One of the most effective dry flies in the West or anywhere that Caddisflies are prevalent. The X Caddis was created by Craig Matthews of Blue Ribbon Flies in West Yellowstone. This hair wing caddis pattern imitates the emerging adult Caddis as it struggles in the surface film while escaping its nymphal shuck. The X Caddis rides lower in the water than other Caddis imitations, and is especially effective on slick water or spring creeks.