Allosaurus fragilis vs. "Creosaurus" atrox

[RaptorRKC@aol.com]

Dear dinosaurophiles, 

Is there any simple way of telling apart _Allosaurus fragilis_ and
"Creosaurus" atrox?  Bakker seems to have shown that these two species are in
distinct genera (whether Creosaurus is correct or atrox needs a new genus is
beyond me).  However, most publications label pictures of these allosaurs as
_A. fragilis_, or, simply, _Allosaurus_.  Since I draw dinosaurs, I need to
know how to distinguish _A. fragilis_ from "C." atrox in the pictures in my
resources.  

Any help would be great!

Rachel Clark

"You smell an awful lot like flowers."