Dromaeosaurus \ / ˌdrɒmiːɵˈsɔrəs \ / was a genus of theropod dinosaur which lived during the Late Cretaceous period ( middle late Campanian ) , sometime between 76.5 and 74.8 million years ago , in the western United States and Alberta , Canada .
Dromaeosaurus was a genus of theropod dinosaur which lived during the Upper Cretaceous period ( middle late Campanian ) , about 75 million years ago .