![]() Immature brown recluse spiders closely resemble the adults except for their smaller size and slightly lighter color. Adult females are ¼-½" long and have long, delicate legs with short dark hair. Immature black widow spiders of both sexes resemble the adult male black widow.Īdult female and male brown recluse spiders are yellowish-tan to dark brown with a dark violin or fiddle-shaped marking on their backs, thus giving them the other name of 'fiddle back spiders'. Newly hatched spiders are white to yellow-white and gradually change to black after three to six molts. Both immature and adult males have yellow and red bands and spots over their backs. Adult males are smaller with much longer legs than females. They have bulbous, shiny, jet-black abdomens with reddish, hourglass-shaped marking on their undersides. What do black widow and brown recluse spiders look like?Īdult female black widow spiders are approximately 1" long and ½" wide. The most common spiders associated with health threats in the United States are the black widow spider ( Latrodectus spp.) and the brown recluse spider ( Loxosceles spp.). Spiders are beneficial to humans because they feed on pest insects in homes and gardens. Most spiders have venom to subdue their prey, but they only use it against humans if disturbed. In contrast, insects possess long antennae, bodies with three segments, three pairs of legs, and usually wings. They differ from insects in that they lack antennae and possess wingless bodies with two segments and four pairs of legs. Spiders are Arachnids, a group that also contains mites, ticks and scorpions. ![]()
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