Spiders of andezite and limestone rocks in Central Bohemia were studied. The material was collected using hanging desk traps. Rocky habitats are inhabited by a well-established spider assemblage. A lower slope angle, and consequently more diverse terrain, probably support a higher species diversity. Some species inhabit exclusively rocky habitats. Segestria bavarica and Theridion betteni occur in the Czech Republic exclusively on rocky habitats. Erigonoplus jarmilae, Zelotes puritanus, and Altella biuncata appear to occur primarily on rocky habitats. Anyphaena furva appears to live on trunks of trees growing on sun-exposed rocks. Some thermophilous species narrow their ecological niche exclusively to southern exposed rocky habitats with a warm microclimate towards the north.