Spiders in this family have eight eyes in two rows, the labium is free, and there are three tarsal claws. Species occur primarily in southwestern USA, but some are known from Central America and Mexico. These spiders build a silken retreat in urban and natural habitats. Females and immatures usually remain at the web site, but males leave the web when mature and enter structures.

Plectreurys tristis (Fig. 18.8a) The adult male is about 12 mm long, and about 26 mm long with legs extended. The cephalothorax and legs are dark brown and unmarked. The carapace is granulated and without setae. The abdomen is yellowish gray, with gray setae. This species occurs in southwestern USA and California. It bites and produces a localized swelling and some numbness at the site of the bite.

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