One of the most abundant flies in Ontario is the Caddis fly. This fly goes through 3 basic stages in its life: Pupa, Larva and air borne fly. Caddis are very important to the fly fisher because they are a staple in nearly all species of fishes diets. Caddis Flies of Ontario Caddisflies or sedge-flies (Order Trichoptera, from Greek trich, “hair”, and ptera, “wings”) 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. Caddisflies have aquatic larvae and are found in a wide variety of habitats such as streams, rivers, lakes, ponds, spring seeps, and