Orcomimus
"Orcomimus" (Pronounced or-coh-MEEM-us) is the name given to an as yet undescribed genus of dinosaur from the Late Cretaceous period 66 million years ago. The dinosaur was an ornithomimid which lived in what is now South Dakota, in the United States. The type was coined by Michael Triebold in 1997, but has never been formally described and is currently a nomen nudum.
"Orcomimus" were bipedal theropods, but these dinosaurs are known from only a pelvis and a hindlimb. "Orcomimus" is thought to be relatively advanced for other ornithomimids at the time, although this is hard to tell from the limited amount of specimens found of the dinosaur.
References
Triebold, M. (1997). "The Sandy site: Small dinosaurs from the Hell Creek Formation of South Dakota." in Wolberg, D., Stump, E. and Rosenberg, G. (eds); Dinofest International: Proceedings of a Symposium. Arizona State University Academy of Natural Science. 245-48