This is where you are just simply wrong. The DNA will show what it's closest relatives are, and this places it on the phylogenetic tree. A new member on the hominidae branch found in the US. would be a real tough thing to explain any other way. You can argue you still can't see the creature, but you can't ignore it's placement on the tree of life, which does give you a description.
http://www.whozoo.org/mammals/Primates/primatephylogeny.htm