Cluster flies

Cluster Flies

Appearance

Similar to the house fly, the cluster fly is 3/8 inch in length and dark nonmetallic gray. The thorax (the middle body segment where the wings and legs are attached) has yellow or golden hairs.

Habitat

The name reflects its behavior of forming clusters before hibernating. Cluster flies are bothersome because they often enter attics and wall voids of structures to over winter, seeking shelter to avoid the cooling temperatures. When temperatures rise, they become active, either leaving the structure or entering the interior.

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Diet

Adults feed on flowers while the young feed on earthworms.

Reproduction

After mating in the spring, the female lays her eggs in cracks in the soil. Hatching in about 3 days, the maggot will burrow into the body of an earthworm to develop. The developmental time from egg to adult is 27 – 39 days. Cluster flies generally produce 4 generations a year.