Close relative of spiders. Barely visible to the naked eye. Some are parasitic and will feed on humans. Bites cause intense itching and irritation. Other species are pests which attack house and garden plants.

Indoors: Species which attack animals often migrate into homes from abandoned rodent or bird nests (in attics etc.). Can be found in basements, kitchens, bathrooms and near hot water pipes. Plant pests can be found on almost any house plant.
Outdoors: Can be found as parasites on birds and other animals, will migrate from one host to another. Plants pests can attack any landscape or garden plant.

Eat starchy glues in book bindings, cardboard boxes and wallpaper.

Indoors: Prefer cool, damp areas, books or behind wallpaper. Often found in attics, basements, closets, and storage cartons.

Harmless, but presence is a nuisance. Feed on decaying plant material and other organic matter.

Indoors: Found in damp basements. Enter via windows or door jams.
Outdoors: Live in damp places near foundations, in leaf piles, rotting vegetation/wood, or in grass clippings.

Few species can inflict painful bites, most merely a nuisance. Webs are unsightly. Some spiders are predators on other insects and other small animals.

Indoors: Spin webs in basements, attics. fireplaces, cabinets, around windows and light fixtures, furniture and chimneys.
Outdoors: Webs are commonly found around windows and light fixtures, and along foundation walls.

Serious pests in buildings. Begin attacking wood near grade level or below and cause structural damage.

Found in wood crawl spaces, floors, and walls of homes, boathouses, wooden piers, fences, stumps, or firewood. Most wood in contact with soil is especially venerable.

Penetrate skin with mouthparts and suck blood from humans and animals. Bites can become infected if tick is not properly remove from skin. Some species transmit diseases including Lyme disease and Rocky Mountain Spotted Fever.

Indoors: Found behind baseboards, in furniture, and on carpeting and walls.
Outdoors: Live in wooded areas around homes and in tall grass. Can crawl up fences and sides of houses.

Larva feed on a variety of stored food, particularly spices, dried foods, nuts, and cereals.

Invade stored products in the home. Often leave extensive webbing as they feed. Reproduce rapidly in areas with abundant food and proper warmth.

Found worldwide. Feed on Stored cereals and other grain products.

Invade and contaminate stored foodstuffs, including spices, boxed cereals and crackers. Small enough to readily penetrate containers which appear lightly sealed.

Larvae: Commonly called maggots; grow into disease carrying adult flies.
Adults: Many carry bacteria that can contaminate food dishes and utensils.

Indoors: Frequently noticed on walls and windows. Will readily land on exposed food.
Outdoors: Found in or near garbage containers. Prefer decaying matter, such as animal waste or compost piles on which to feed and lay their eggs.

Inflict painful stings when aggravated or nest is threatened. (Includes Yellow Jackets which may nest in the ground or in structures.) Some people are highly allergic to stings.

Indoors: Can be found in windows, lamps and draperies.
Outdoors: Nest under siding or eaves of buildings, in trees or in the ground. Commonly create a nuisance at outdoor events such as picnics.

Numerous species, some which carry disease. Inflict itchy, sometimes painful bites as they feed on blood. Need source of water to lay eggs.

Indoors: Buzz around pets and humans seeking blood meal (required for reproduction of most species).
Outdoors: Lay eggs in or near shallow bodies of water and marshy areas. Often noticed around densely shaded areas and patios, or picnic areas and shrubbery.