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The brown recluse is one of three spiders in North America with dangerous venom, the others being the black widow and the Chilean recluse. Brown recluse spiders are usually between 6 and 20 millimetres (0.24 and 0.79 in), but may grow larger. While typically light to medium brown, they range in color from whitish to dark brown or blackish gray.
The brown recluse is known to occur in a range from southeastern Nebraska to southwestern Ohio, south to northwestern Georgia and into Texas. Occurrences outside that range are exceedingly rare. Related species exist in the southwestern United States.
Brown recluse spiders live in an area spanning southeastern Nebraska to southwestern Ohio, south to northwestern Georgia and into Texas (red). Occurrences outside this range are very rare.
Their native range lies roughly south of a line from southeastern Nebraska through southern Iowa, Illinois and Indiana to southwestern Ohio. In the southern states, the Brown Recluse Spider is native from central Texas to western Georgia. Brown Recluse Spiders are generally not found west of the Rocky Mountains.
The brown recluse, L. reclusa, in its normal range, prefers to inhabit gaps under rocks, boards, and the bark of dead trees and logs. In structures, it will live inside cracks in walls and boards and behind and under any number of items in storage.
Brown recluse, (Loxosceles reclusa), venomous light tan or yellow spider most common in the western and southern United States. It has a body length of about 7 mm (0.25 inch) and a leg span of about 2.5 cm (1 inch). On the front half of its body (the cephalothorax), it has a dark violin-shaped.
Brown recluse spiders are usually between 6 and 20 millimetres (0.24 and 0.79 in), but may grow larger. While typically light to medium brown, they range in color from whitish to dark brown or blackish gray. The cephalothorax and abdomen are not necessarily the same color.
The map below shows the range of the brown recluse spider in the US. The shaded areas of the map are where the spider is considered to be indigenous. The closer to the edge to a shaded area you get, the less likely it is you will find this spider.
Brown recluse spiders mature in about a year and have an average lifespan of 2 to 4 years. The females produce up to 5 egg sacs in a lifetime. Infestation levels in homes vary greatly, ranging from one or a few spiders to several hundred.
Brown recluses range in color from tan to dark brown, but are often a golden brown. The coloration is generally uniform with no stripes or bands on the legs (Fig. 1). The fiddle marking is usually dark brown or black, with the neck of the fiddle pointing towards the abdomen (Fig. 2).