![]() They are thought to be the cause of most in-home spider bites in Colorado. Their bite is painful but usually does not cause any side effects. These spiders are mostly pale in color and measure about 6 mm (1/4 inch) in length. They are usually found in silk webs in the corners of homes, near the ceiling or in wall cracks. Yellow sac spiders (Family: Miturgidae) commonly live and breed in homes, especially in the fall. They are not pests in the home, and while some species occasionally enter the home, they are not a threat to humans. They are active hunters that can jump short distances to capture prey. Jumping spiders (Family: Salticidae) are small or moderate in size, measuring about 4-12 mm (1/6-1/2 inch) and can be brightly colored or shades of black, brown, or gray. Their bodies measure about 9-15 mm (1/3-2/3 inch) in length. Their venom is not dangerous to humans, but they can deliver a painful bite. Woodlouse spiders (Family: Dysderidae) have smooth bodies with distinctive red/orange legs and thorax and conspicuous large fangs. Like wolf spiders, they also build silk retreats in the soil. Outdoors, ground spiders live under logs, rocks, or in the soil. These spiders are small, typically measuring less than 1.3 cm (1/2 inch). Ground spiders (Family: Gnaphosidae) can enter homes when temperatures drop but are completely harmless to humans. Their webs are usually irregular and sticky, built in corners of buildings and dark areas. These spiders have bodies around 8.5 mm (1/3 inch) but can appear much larger due to their long legs. When hatching, the spiderlings will remain on the mother’s back for the first few weeks.Ĭellar spiders (Family: Pholicidae) have long, narrow legs and are often confused with harvestmen. Interestingly, females carry the egg sac on spinnerets at the rear of the abdomen. Small species are commonly misidentified as funnel weaver spiders. Larger species can bite humans, though their bite does not pose a health risk. Most are brown or gray and vary in size and appear hairy. When fully grown, they can reach lengths of 1.3-5 cm (1/2-2 inches). They do not create a web to capture prey, but can create a silk retreat in protected areas such as under rocks, in soil, etc. Wolf spiders (Family: Lycosidae) usually do not enter homes unless their habitat is disturbed. ![]() These spiders are commonly misidentified as species in the family Lycosidae. They vary in color, size, and shape but usually have four pairs of eyes that are the same size. They create protective mats of silk in vegetation for shelter, which they can retreat into when threatened. When fully grown, they can reach lengths of 8.5-17 mm (1/3-2/3 inch). They are the most common spiders in homes, typically found in the early fall when temperatures start to cool. For more information on western black widow spiders, consult the webpage.įunnel weaver spiders (Family: Agelenidae) create funnel shaped webs. Adult females typically have black bodies and are 6.4-8.5 mm (1/4-1/3 inch), while males tend to have brown bodies with striped markings and are 3.2-6.4 mm (1/10-1/4 inch). The hourglass is red on females and orange or yellow on males. Both male and female western black widow spiders have the characteristic hourglass shape underneath their abdomen. They can inflict a painful and potentially harmful bite, with young children and the elderly among the most susceptible individuals. There are a handful of poisonous spiders in Colorado, however, including the Black Widow and the Brown Recluse, as well as the Tarantula.Western black widow spiders, Latrodectus hesperus, (Family: Theridiidae) are the most dangerous spider found in the home. The majority are considered completely harmless even if they do attempt to bite. There are a lot of species of spider to be found in Colorado including wolf spiders and water spiders. Although the spider was once considered to have necrotic venom, advanced study shows that this was likely a different species of spider, and the Hobo Spider is now considered harmless. Despite their nickname of the Aggressive House Spider, Hobo Spiders are not considered aggressive and will not attack unless threatened. The Hobo Spider is sometimes referred to as a funnel-web spider, but should not be confused with the Australian Funnel Web.
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