Funnel web spiders belong to the Agelenoidea family of spiders. These brown spiders receive their names from the shape of their webs, which resemble funnels. Funnel web spiders build their webs adjacent to household foundations, shrubs and grasses. Contrary to other web spiders, funnel web spiders are extremely quick. The only dangerous funnel web spider, the hobo spider, is found in Utah. However, a bite from hobo spiders is not life-threatening, according to the Illinois Department of Public Health. Another funnel web spider living in Utah is grass spiders, which are brown with dark stripes on their abdomen.
The spider family Salticidae is the scientific classification for all jumping spiders. As their name suggests, jumping spiders have the ability to leap horizontally. Jumping spiders use this ability to pounce on unsuspecting prey. This spider species does not rely on building webs to catch prey and, as a result, does not construct webs. In Utah, brown jumping spiders include members of the Habronattus genus -- tiny jumping spiders -- Phidippus genus, or the bold jumping spiders, and Thiodina hespara, a jumping spider with eight eyes on top of its head.
As their names suggest, these spiders resemble crabs, with flat abdomens, cephalothoraxes and heads. Also, the two front legs of crab spiders angle outwards. Crab spiders are able to move sideways and backwards, similarly to crabs. When hunting for prey, crab spiders ambush their victims by hiding behind plants or rocks and pouncing on them when they are within reach. Crab spiders do not build webs and belong to the Thomisidae family of spiders. Bark crab spiders and running crab spiders are two brown species native to Utah. Utah's brown crab spiders are able to camouflage with trees and brown plants due to their coloration.
Wolf spiders are brown spiders in the Lycosidae family; these spiders have hairy bodies and legs. A wolf spider's bite is venomous, but not lethal. While they are not aggressive, wolf spiders will bite if provoked. Since they do not build webs, wolf spiders seek shelter in underground burrows. Male wolf spiders spend much of their life alone hunting for food. Female wolf spiders are known for carrying their offspring on their back. In Utah, wolf spiders are found in the northern region of the state, especially on Antelope Island and the Salt Lake City area.