Caddis are small moth-like insects that have two pairs wings. They are closely related to Lepidoptera (moths and butterflies) which have scales on their wings, and the two orders together form the superorder Amphiesmenoptera. There are numerous species that occur in Ontario, but I tend to focus on three of the more dominant species. The Spotted Sedges (Hydropsyche), Speckled Sedges (Cheumatopsyche), and the Little Black Caddis (Chimarra). Early in the season, larval imitations of caddis are an important fly to fishers. Later in the season, when hatches are well underway and many species of fly are hatching and mating, caddis can be the best fly to tie on as there will almost always be trout sipping caddis off the surface.