What kind of spider has is black with a yellow diamond on its back and yellow stripes on it front 2 legs?

Question by d_v_s_420: What kind of spider has is black with a yellow diamond on its back and yellow stripes on it front 2 legs?
This spider was encountered on my bacl porch. I live in a south suburb of Chicago, Il. The spider was jet black with a yellow diamond on its back [...]

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