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This spider is imaged here as found on a prickly pair cactus near Florida Station, Santa Rita Experimental Range during Bugguide Gathering 2013. White hairs on the abdomen, legs being shorter relative to body than posted pictures of P. viridans, and lack of white marking on abdomen indicate that this is P. longipalpis, based on the Info page. The egg sac and fat abdomen imply it is female.