Abstract
The cluster fly, Pollenia rudis (Fab.), has been an interesting species to the entomologist for a number of years. It is a common fly in most parts of the United States and yet, until recently, very little was known about it. The species is the type of the genus Pollenia and is by far the best known species of the genus. The cluster fly is ordinarily observed in large numbers only in the autumn and spring. It is not abundant during the summer. The species becomes troublesome in houses in the autumn while seeking hibernation and again in the spring at the close of the hibernating period.

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