Ladybird beetles are a well-known group of small and brightly colored beetles. Adults are 4-10 mm long, and the head is concealed from above. They are distinguished from chrysomelid beetles by three tarsal segments; in chrysomelids there appear to be four segments. Larvae are elongate, somewhat flattened, and covered with tubercles and spines. Most of the species are predaceous as both larvae and adults, and feed primarily on aphids. Many species in temperate regions hibernate as adults, frequently in large aggregations in protected locations. Characteristics of the ladybird species that form aggregations include: they are usually predators of aphids, they exhibit long dormancy or diapause periods, and mating occurs mostly at the aggregation site, shortly before the beetles disperse after winter dormancy.

Two-spotted ladybird beetle, Adalia bipunctata Adults are 3-5 mm long. The prothorax has an irregularly white margin, and the red elytra have two round median spots. This species is common in Europe and North America, especially along the Pacific coast from California to British Columbia. Adults occur in large numbers and seasonally invade residential and commercial buildings.

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