Spiders in the home Order: Araneae Description Western black widow spider Western black widow spiders, Latrodectus hesperus, (Family: Theridiidae) are the most dangerous spider found in the home. They can inflict a painful and potentially harmful bite, with young...
Western black widow spider, Latrodectus hesperus Order: AraneaeFamily: Theridiidae Description The western black widow spider is the most common of the Latrodectus spp. inhabiting Colorado. Females are usually black or dark brown and rarely grow larger than 6.4-8.5 mm...
Harvestmen Order: OpilionesFamily: Phalangiidae, Sclerosomatidae Description In Colorado, commonly encountered harvestmen include certain Leiobunum spp. and the invasive Philangium opilio. The most distinguishable feature of harvestmen are their very long and thin...
Boxelder bug, Boisea trivattata Order: HemipteraFamily: Rhopalidae Description The boxelder bug is a common household pest in Colorado. They can feed on a variety of plants, and boxelder seed pods are the preferred food source. These insects are often found sunbathing...
Drosophilid flies, Drosophila spp. Order: DipteraFamily: Drosophilidae Description Adults are small flies with stout bodies, measuring approximately 3 mm (1/8 inch) long, and typically have bright red eyes. The abdomen often has bands and is darker than the...
