Dilophosaurus

Dilophosaurus wetherilli (Greek, "double crested lizard") was the first large carnivorous dinosaur to appear in North America during the early Jurassic period. It is distinctly known from its famous two crests rounding above its skull. Its fossils were uncovered in Southwestern US and possibly China. Although primitive in the terms of Tyrannosaurus rex or Allosaurus, it was actually a very advanced predator at its time.