German cockroach
Description - Adult German cockroaches are ½ to 5/8 inches in length.Although they have fully developed wings, they do not fly. They can be identified by two parallel lines running from the back of the head to the wings
Biology - German cockroaches usually prefer a moist environment with a relatively high degree of warmth. They are mostly active at night when they forage for food, water and mating. During the day they hide in cracks and crevices and other dark areas where warmth is provided. They are usually found in kitchens(near dishwashers, stoves and sinks) and in the bathrooms of structures.
Prevention - German cockroaches can enter buildings in boxes, grocery bags and suitcases. Another key factor in prevention is sanitation. Clean up spilled foods, including crumbs on the floor. Do not leave dirty dishes overnight. Empty garbage each evening into a sturdy container with a tight fitting lid.
Yellowjackets
Description - Yellow jackets have sometimes been 
mistakenly called bees, but they are in the wasp family.The workers are 3/8-5/8 in length and have a yellow and black face and patterned abdomen.
Biology - Yellow jackets are social pests living in colonies containing workers, queens and males. They nest in areas such as eaves, in the ground or attics. They feed on sweets and proteins and commonly invade outdoor activities. Yellow jackets pose health threats to humans and can cause allergic reactions.
Prevention - Do not leave sweet drinks or meats in accessible areas. Clean up and remove trash and food after outdoor activities.
Stink bugs
Description - Stinkbugs are ¾ of an inch long. Their bodies are triangular in shape and brown, gray or dark green. They release a n odor when disturbed or crushed.
Biology - Stink bugs only feed on their host plants and are seldom encountered by humans. They prevent caterpillars and other insects from destroying plants, trees, crops and gardens.
Prevention - To prevent stinkbugs from entering homes and buildings seal cracks around windows, doors, siding utility pipes, behind chimneys and other openings with a silicone chalk. Damaged screens on doors and windows should be repaired or replaced. Treatment should be performed in the late summer or fall just prior to pest congregation.
Carpenter bees
Description - Carpenter bees are 1 inch long and look like typical bumblebee, but often lack yellow stripes.
Biology - Unlike bumble bees, carpenter bees are solitary pests. Female carpenter bees will chew a tunnel into a piece of wood to build a nest. The bits of wood she chews and deposits outside the nest are called frass. The male carpenter bee guards the outside of the nest. He does not have a stinger, but, this constant buzzing causes concern for some.
Prevention - Carpenter bees prefer bare wood, so painting and staining wood can sometimes deter them.
Brown recluse spider
Description - Brown recluse spiders are ¼-3/4 inches in length, a brown violin marking on their back. They are nocturnal and feed on crickets. 
Biology - Recluse spiders build irregular webs in woodpiles, and sheds. They can be found indoors in storage areas and dark areas. The spiders bite in defense and do not bite humans instinctively.
Prevention - Avoid keeping clothing on the floor. Store clothing and shoes inside plastic containers. Shake out all clothing before wearing or washing.