Pollenia rudis (Fabricius), the cluster fly, is a common household pest in Iowa in the fall, winter, and early spring. This house fly is readily distinguished from Musca domestica L. by its thoracic pubescence of fine crinkled golden hairs, its sluggish, almost tame habits, and its parasitizing woodland earthworms of the genus Helodrilus (De Coursey 1927) instead of breeding in horse manure. The flies were readily available indoors at Ames throughout the winter, as they emerged a few at a time from hibernation in window crevices, from moldings, and from behind furniture.
Proceedings of the Iowa Academy of Science
©1941 Iowa Academy of Science, Inc.
Jones, David T.
"The Histology of the Digestive Tract of the Cluster Fly, Pollenia rudis,"
Proceedings of the Iowa Academy of Science, 48(1), 407-415.
Available at: https://scholarworks.uni.edu/pias/vol48/iss1/112