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Micrathena gracilis
He is black with white strioes and looks like his is carrying a shell.
He is in a shaded area with a web attached to two low limbs and an old fence with a lot of mosquitoes to feast on.
Welcome to Project Noah, RaeAnn! Mrs. Pbio provided the correct ID. Please update your spotting with the common name “Spined micrathena,” and the scientific name, Micrathena gracilis. :-)