Waipio Valley Stream Restoration Study

Insects: Native Species

Scientific name: Campsicnemus brevipes
Common name(s): Hawaiian long-legged fly

Campsicnemus brevipes

Status: Endemic

Habitat: Riffles and cascades in streams

Preferred Area of Stream: Highly oxygenated, clean and cool water in heavily flowing areas on wetted boulders and rocks.

Range in Hawai‘i: O‘ahu, Maui , and Hawai‘i Islands

Diet: Both larvae and adults are predatory and the adults feed by sucking the juices from soft-bodied animals after they are crushed or milled by the labella or mouthparts.

Predators: Predatory insects such as larval and adult damselflies and dragonflies, native and introduced fish.

Fact: Campsicnemus brevipes adults are smallish but beautiful metallic blue-green bodied aquatic flies with long legs and the adults are easily distinguished from others in the long-legged fly family by the swollen middle femur and two large and thick bristles at the front of the middle femur, or trochanter. This species hangs around the fast-white water areas of the stream and is normally not easily observed until it is collected in your aquatic net.