A. The sandstone boulder and cliff face habitat of Xantusia gracilis, Truckhaven Rocks, San Diego County, California. B. Slot canyon microhabitat of X. gracilis, Truckhaven Rocks. C. Crumbling, exfoliation-like microhabitat of X. gracilis, Truckhaven Rocks. D. Relatively smooth, compact granite boulder microhabitat of X. henshawi showing a cap-rock (at top) and an exfoliation (in lower right), Mountain Meadows, San Diego County, California. E. Granite boulder outcrop habitat of X. henshawi, Aguanga, Riverside, County, California.