Dromaeosaurus
Matthew and Brown originally placed Dromaeosaurus within "Deinodontidae" (now known as Tyrannosauridae), based on some similarities in the general proportions of the skull. In 1969, John Ostrom recognized that Dromaeosaurus shared many features with Velociraptor and the newly-discovered Deinonychus, and assigned these forms to a new family: Dromaeosauridae.