Common house spiders build tangled cobwebs in corners, windows and light fixtures. Cellar spiders have tiny bodies and very long, thin legs and hang in loose webs in basements and garages. Wolf spiders are large, hairy, fast hunters that run across floors without a web; females carry an egg sac and then their young on their backs. Grass and funnel-web spiders build flat sheet webs with a tunnel in lawns and shrubs. Jumping spiders are small and compact with big front eyes, and yellow sac spiders are pale spiders often seen on walls and ceilings at night.
The brown recluse is tan to medium brown with a darker violin shape on its back, though that mark is easy to misread. Better tells: six eyes arranged in three pairs, and legs that are a single even color with no bands or obvious spines. The body is about three-eighths of an inch. They hide in undisturbed spots — boxes, closets, behind furniture, in stored clothing and shoes — and Kansas City is within their native range.
Black widows are not commonly found here, but they are easy to recognize. The black widow is glossy black with a red hourglass on the underside of the abdomen. Its web is messy and low to the ground: woodpiles, utility meter boxes, window wells, under decks and outdoor furniture, and the corners of garages.