About phorid flies
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Their common name, humpbacked fly, reflects their humpbacked appearance.
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Adults are about 1/64 - 1/4" in size.
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There are several species of small black flies that may occasionally become pests in buildings.
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These can include phorid flies which breed in decaying organic matter of plant or animal origin.
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Extremely large numbers of phorid flies on the first floor of a structure may indicate a broken drain or sewer line under the structure.
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Removing or drying the organic matter where the larvae live will eliminate the problem.