“Black Flies”
Genus Overview
This widespread genus includes at least 154 North American species. Larvae need moving water to feed with the filtering fans on their heads, either in streams or in wave-washed shores of lakes.
Characteristics
POLLUTION TOLERANCE
Southeast: 4.4 - 8.7
Upper Midwest: 6 and higher
Midwest: 4.8 and higher
Mid-Atlantic: 6 and higher
0 = least tolerant, 10 = most tolerant
FEEDING HABITS
Collector / Filterer
MOVEMENT
Clinger
DISTRIBUTION
Widespread (east of the Rocky Mtns.)
HABITAT
Lotic-erosional
Diagnostic Characters
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