In this report on a single hominid tooth found by Swedish archeologist Birger Bohlin at the Zhoukoudian site in 1927 Black named a new genus and species of hominid, Sinanthropus pekinensis. He characterized the specimen as representing “a new genus of the family Hominidae to be named Sinanthropus. . . . The species of which the dental characters have been described in detail in the foregoing pages may be named S. pekinensis” (p. 21). This report follows Black’s brief notice in Nature (“Tertiary man in Asia: the Chou-Kou-Tien discovery,” Nature 118 [1926]: 733-734) describing two hominid teeth discovered at the Zhoukoudian site between 1921 and 1925 by archeologist Otto Zdansky.