A pitfall trap survey of spiders was conducted on the Dalquest Research Site in the Trans-Pecos counties of Brewster and Presidio, Texas, within the northern Chihuahuan Desert, U.S.A. During 13.5 months 1,326 spiders were collected from two separate habitats. Sixty-six recognizable species representing 24 families and 46 genera were identified. The habitats, which were 800 m apart, had 20 shared species. The Sandy Canyon Site contained 29 unique species, whereas the Camp Site contained 17. Sites differed in vegetation, elevation, soil type, and availability of water.
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