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Message: <blockquote data-quote="Sabeth" data-source="post: 13123" data-attributes="member: 545">To be 100% accurate you need to look at the inside of the exuvium (cast "skin") of a freshly molted T. At the very front of the abdomen, right where it meets the prosoma (the T's "head", so to speak), females will have a small leaf-like flap, called the epigynal fold, which they use for storing eggs. Males will not have this fold. The two sexes also have external characteristics which set them apart from each other, although these are not totally reliable. Females are larger and generally have more bulk (a bigger abdomen). Males are often smaller, more lanky and their legs are longer. They also have clubbed pedipalps, and the males of many species have tibial hooks on their forelegs. But again, the only way to tell sex for certain is to examine the molt.</blockquote>