Adults are small, oval beetles that are 3-8 mm long; the body is smooth and shiny, and often brightly colored. The head is visible from above, the pronotum is excavated or grooved laterally, and the sides may extend forward. Some species have tarsi appearing four-segmented; for others tarsal segment 3 is small, and the tarsi appear three-segmented. Most species occur in natural habitats under bark and in fungi or decaying fruit.

Hairy cellar beetle, Mycetaea subterranea (= M. hirta) (Fig. 5.4e) Adults are 1.5-1.8 mm long; the body is bicolored brown to dark brown and shiny; the elytra is subshiny and with distinct pale setae. Antennae are about half as long as the body, and have a three-segmented club. The pronotum has lateral grooves and a raised edge. Full-grown larvae are 2.22.5 mm long and with scale-like setae on thoracic and abdominal segments; setae are slightly longer laterally. This species occurs in granaries and warehouses and it is associated with moldy grain. It is widely distributed, including North America, Europe, Asia, and Hawaiian Islands.

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