NEW WORLD PALEO-INDIAN—ROBERTS 417 
by some of the physical anthropologists to belong in that category. 
In this connection it may be mentioned that this is the only example 
among the many purported early American skeletons where the skull 
is not definitely of the long-headed type. In this case it is 
mesocephalic. 
THE MEXICAN ARBA 
There has been little evidence thus far for Paleo-Indians in the 
Mexican area. No Folsom-type points, with the exception of the 
two in Sonora about which practically nothing is known and one 
possible fluted blade from Tamaulipas (Prieto, 1912, fig. 13), have 
been found south of the Rio Grande. Some discoveries suggestive 
of certain antiquity have been made, yet none has been demonstrated 
-to compare in age with Sandia, Folsom, and similar complexes. In 
fact it is agreed that. they are much more recent (Martinez del Rio, 
1948, pp. 168-170). It seems improbable, however, that no such finds 
will be made; there is always a chance that one will come to ight. Up 
to the present so little work has been done in the northern districts 
that, with the exception of knowledge of the occurrence of some 
scattered late village sites and protohistoric ruins and a few caves that 
date within the Christian Era, there is virtually no information on 
the remains in that area. Bison roamed as far south as southern 
Durango and were in the region around Monterrey in Coahuila as 
late as the beginning of the seventeenth century (Hornaday, 1889, 
p. 882), and there is the possibility that older species may have occupied 
the area as well because there are several large deposits of bones 
weathering from the beaches around the beds of lakes that must have 
dried up several millennia before the coming of the Spaniards. Hasty 
examination of these bone beds indicated that much of the material 
was bison, but no attempts were made to collect specimens or to deter- 
mine the species. It is not improbable that some of the older forms 
are represented there, and inasmuch as the earlier peoples were mainly 
hunters and followed the game in its migrations, it would not be sur- 
prising if, eventually, bones from extinct bison accompanied by types 
of implements made by the Paleo-Indians were found there. If the 
generally accepted ideas about the peopling of the New World from 
Asia are correct, the Mexican plateau must have served as a broad 
highway to Central and South America, and although it may be 
difficult to find, there should be some evidence of the migrations passing 
that way. 
CENTRAL AMERICAN FINDS 
Finds in Central America show that the bison formerly ranged 
much farther south than Mexico. A horn identified as bison came 
from northern Nicaragua many years ago (Rhoads, 1898), and tracks 
