any significance in the fact that brown pericarp occurs 
in both Mexico and Peru, remain for the moment un- 
answered questions. 
There seems little doubt, however, that the eight- 
rowed maize, Harinoso de Ocho, which features so prom- 
inently in the evolution of maize in northwestern Mexico, 
came originally from South America. And it seems quite 
probable that this race is related to the prehistoric flour 
corn of Cafon del Muerto described by Anderson and 
Blanchard (1942) and to various living races of maize in- 
cluding the Papago flour corn illustrated by Carter and 
Anderson (1945) and the eight-rowed flour corn of the 
Indians of the northern Great Plains, illustrated by Will 
and Hyde (1917). 
The race, Cristalino de Chihuahua, like Chapalote and 
Harinoso de Ocho, seems to have spread throughout the 
American Southwest. Ears resembling it occur widely 
among the maize varieties of the Indians. Carter and 
Anderson (1945) in their study of southwestern maize 
varieties recognized two of the elements now identified 
in the archaeological specimens. One of these, a many- 
rowed maize with tapering ears, was designated as ‘‘Mex- 
ican’’; the other, an eight-rowed corn with large kernels, 
was called ‘‘Eastern.’’ In the light of the archaeological 
remains described above, it now appears that both of 
these elements are Mexican, the first, Chapalote; the 
second, Harinoso de Ocho. 
All of the evidence combined points to the conclusion 
that the highlands of northwestern Mexico served as a 
corridor for the diffusion of maize from Mexico into the 
American Southwest. 
SUMMARY 
1. Collections of prehistoric maize from five caves in 
Sonora and Chihuahua in northwestern Mexico are de- 
scribed. 
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