ANNUAL REPORT SMITHSONIAN INSTITUTION, 1911. 
314 
In 
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The newer ones are steeply conical, 
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Bahia, and runs west 376 kilometers into the State of Minas Geraes, 
ant hills are big and abundant. ( 
but with age they become more or less rounded and flattened. 
the vicinity of Urucu Station (kilometer 226) the mounds are so thick 
and so close together that the country looks like a field of gigantic 
potato hills. 
