Which of the following flies has a black checkerboard pattern on its abdomen?

The fly that exhibits a black checkerboard pattern on its abdomen is the cluster fly. This distinctive pattern helps in identifying it among other similar species. Cluster flies are known for their somewhat larger size compared to house flies, and they often congregate in large numbers, particularly in homes during the cooler months as they seek shelter.

The house fly, while common, does not have this particular abdominal pattern; it typically has a more uniform grayish body without any notable markings. The blow fly, recognized for its metallic coloration, also lacks the checkerboard pattern and instead features a shiny appearance. The humpback fly gets its name from its rounded shape but similarly does not possess the black checkerboard marking that identifies the cluster fly.

Understanding the unique identification features, such as the checkerboard pattern on the cluster fly's abdomen, is crucial for pest management professionals in correctly identifying and managing different fly species.