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Harpaphe haydenian
Usually it is quite tricky to ID a millipede, but I think in your case it should be Harpaphe haydeniana, if I look carefully at the markings (shape, size and location). Maybe you also have other pictures to compare with the ones from the link.
Polydesmida, Xystodesmidae, Xystedesminae, Xystodesmini.
http://bugguide.net/node/view/389609
http://bugguide.net/node/view/192083
http://bugguide.net/node/view/15008/bgim...