Many types of spiders can instill fear as they scurry across a room or jump out from a dark corner. Even though most species of common house spiders are harmless and don’t bite, few people like seeing them. The most common 8-legged arachnids that live in houses are brown spiders. Among the more than 48,000 species of spiders are black spiders, brown and black spiders, little red spiders, and even white spiders.