This is one of the largest of the Loxosceles species, with a body length of around 5/8 inch. It is not a resident spider in the U.S. as far as is known, but has been discovered a number of times, associated with imported materials from South America. Females create an egg sac and deposit up to 50 eggs in it, with a potential to create 5 egg batches in one year. Development from egg to adult requires about 1 year and they can live for up to 7 years. They are nocturnal and prefer to live and forage in locations that have little other activity. These are not aggressive spiders and bites are rare. Recent opinion from the University of California suggests that the venom of this species should be considered equal in potency to that of the Brown Recluse, but this remains unproven. The venom is, however, capable of causing skin disruption and lesions but for 90% of proven victims of a bite the wound heals quickly and without scarring.
As with most spider control habitat modification is important, removing or elevating all materials on the soil that might serve as a hiding place and moving firewood and other unnecessary materials away from the structure. These are hunting spiders that do not spin webs for the capture of food. A good program of exclusion should take place to permanently close all openings the spiders may use for entry to structures. The use of a labeled residual, contact insecticide around doorways and windows, entry points, and into possible harborage will help to kill the spiders. This species is not likely to take up residence within a structure.