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Extension > Garden > Diagnose a problem > What insect is this? > Insects found indoors > Winged Insects - 1/4 inch up to 1/2 inch > Cluster fly

Photo Credit: Jeff Hahn, University of Minnesota#alt-2
Photo Credit: Whitney Cranshaw, Colorado State University,
Cluster fly, Pollenia rudis
Size: 3/8 - 1/2 inch long
Description: House fly-like; grayish black; with short yellowish hairs on thorax

Where/When: Cluster flies are found in and around homes during fall and spring, and occasionally during winter when mild temperatures occur.

Significance: Cluster flies do not harm people or property, although they can be a nuisance, especially when large numbers are present. They do not reproduce indoors.
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