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Keys to Midges - Black Fly

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Identifying Characteristics of the Black Fly

Larvae

1) Size range 1/8" to 5/16"
2) Swollen abdomen
3) Fanlike mouth brushes
4) Larva are attached by the end of their abdomens to the top of rocks

Pupa

1) High branched spiracular gills on head
2) Can be found in slipper-shaped cases on rocks and vegetation

Adult

1) Wings are broad
2) Thorax has strong arch
3) Antennae are short

Larva	Pupa	Adult

Illustration by Andy Cooper

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