The term 'Primitive Fellows' can be broken down into two crossword solutions: APEMEN (6 letters). The term 'APEMEN' refers to a group of primates that are believed to have been the ancestors of modern humans. They were characterized by their small stature, large brains, and long arms. They lived in Africa and Asia during the Pleistocene epoch, which lasted from 2.6 million to 11, 700 years ago.