Coreidae

Leaf-footed bugs are large, elongate insects with the head narrower than the pronotum. Some species have the hind tibiae expanded and with spines in the males. They have well-developed scent glands and give off a distinct odor when disturbed or handled. Coreids are primarily plant-feeders but some are predaceous on other insects. There is usually one generation per year, and adults overwinter in garden debris and leaflitter. Peststatus ofthefewperidomestic species is based on their overwintering habits. The number ofindividuals is usually small, but their presence indoors is unacceptable.

Squash bug, Anasa tristis Adults are 13-18 mm long, grayish brown, with the edges of the abdomen orange, or striped orange and brown. Antennae are uniformly dark brown or yellow marked with dark spots; at the base of the antenna is a small tubercle. Venter and legs are mottled yellow and brown. Immatures are slightly green and sometimes covered with a white, powdery material. Eggs are laid on plantleaves singly or in batches of 17-19. Females lay about 13 eggs per day at 30 °C, and about four eggs per day at 20 °C. Development from egg to adult takes about 24 days at 30 °C. There are 1-3 generations per year, depending on location: 1 in the east, 1.5 in midwest, and 3 in western USA. Adults overwinter in natural habitats under loose bark and leaves. They are known to invade houses, especially basements, in the fall. They do not bite people, but are a nuisance by their presence. This bug feeds on a variety of cultivated crops in the genus Cucurbita, particularly summer squash and pumpkin. It is distributed throughout most of the USA and in Mexico.

Thasus acutangulus Adults are 35-40 mm long, and the body is orange and black. The nymphs are orange, yellow, and black. Adults and nymphs are commonly found onmesquiteand other trees in southeastern North America and Central America. Nymphs form aggregations on trees and shrubs, and as a group they give off noxious secretions when disturbed. Aggregations on ornamental trees can be a nuisance around houses and commercial buildings.

Western conifer-seed bug, Leptoglossus occidentalis Adults are about 18 mm long; the body is reddish brown to black, and has pale zigzag stripes across the forewings. Hind legs are long and hind tibiae are flattened. Abdominal segments are orange and black striped. Eggs are laid in rows on the needles of coniferous trees. Nymphs feed on needles, ripening seeds of pine trees, and become adults in late summer. Adults overwinter in protected locations, including around and in buildings in urban and rural areas. They usually gather on south- and west-facing sides of structures, then move to cracks and crevices, or indoors. They do not usually occur in large numbers. This species is distributed in western USA and feeds on the seeds of Douglas fir trees, and the needles and green cones of other pine trees. It has expanded its range to eastern USA, and frequently occurs indoors in midwestern and eastern states.

Other Coreidae In Japan, there are several species that overwinter around the perimeter of buildings, including Acan-thocoris sordidus, A. striicornis, Cletus trigonus, Homocerus unipunc-tatus, Hygia opaca, and Plinachtus bicoloripes.

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