"When did Darwin claim that 'Aryans' were superior to 'Semites'?"
I never said he did. You're twisting my words. Chamberlain and Gobineau were Aryan supremacists (well, Teutonic supremacists, more precisely). Hitler was a big fan of Gobineau, and more stridently, Chamberlain. In his later life, Chamberlain became a confirmed Nazi and was hailed as one of the "philosophical fathers" of the Nazi movement.
I don't know if Hitler even read Darwin or cared much about him. And I think it's a stretch to equate Darwin's THEORY of evolution with anything that Hitler believed.
}:-)4