Black fly larvae (Family Simuliidae)

Key features:
- quite small
- bulbous at one end
- constricted in middle
- size range:  1/16" - 1/4"

Black fly larvae are small and slightly bulbous at one end. They use this bulbous end to attach themselves to rocks and other material, usually in the faster flowing areas of the riffle. They may be found in groups, attached to stones and leaves and will often curl into a "u" shape when pulled off and held in the hand. Most larvae are gray or brownish in color.