Carolyn The ants you describe, with the pebble covered nest, are Harvester Ants. The species you have are most likely to be, Pogonomyrmex salinus. There are several other possible species. A good web sight is http://www.antweb.org/tools.do John Weiser 50 F and spring like in Reno. Have to keep reminding myself It ain't over yet!!
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