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They aren't hard to spot, either. Jorō spiders have three-inch, yellow-and-blue striped bodies with lanky legs. When fully grown, a female jorō spider is"about the size of an adult's palm," explains Orkin. Now, that's athought. Male jorō spiders are typically brown and smaller in size but still larger than your average garden spider.will continue to spread throughout the Eastern Seaboard, landing in parts of New Jersey and New York as early as this summer.