 In the late nineteenth century , José <unk> y Serrano described a colossal head as having " Ethiopian " features and speculations that the Olmec had African origins resurfaced in 1960 in the work of Alfonso Medellín <unk> and in the 1970s in the writings of Ivan van <unk> . Such speculation is not taken seriously by Mesoamerican scholars such as Richard Diehl and Ann <unk> . 
