The name is Russo Tiesi, with Tiesi being the "second" surname, used in Italy to distinguish between different branches of the same family name.
The Russo Tiesi family returned to New York on February 23, 1914 aboard the Vandyck after departing from Buenos Aires. Apparently they had lived in Rosario, Argentina, starting about late 1910. Here's the ship manifest; they appear on the first 4 lines: http://www.ellisisland.org/search/shipManifest.asp?MID=08175263080080506560&pID=100400010202&http://www.ellisisland.org/search/shipManifest.asp?MID=08175263080080506560&pID=100400010202& (they are incorrectly indexed as Russo Fieso).
Leonardo Russo Tiesi was born ca. May 1882 in Chiusa Sclafani, Sicily, to Francesco Russo Tiesi and Giuseppa Pancamo. His wife, Anna Terranella, was born in Campofelice, Sicily, in April, 1891, to Salvatore Terranella and Giuseppa Randazzo.
Leonardo and Anna's second son, Salvador, was born in Rosario on June 9, 1912. When he naturalized in Chicago in 1941, he listed his nationality as Argentinian.
I am assuming that the Russo listed on line 5 of the manifest is Leonardo's younger brother, also named Salvador, who was shot to death in Chicago a few months after they returned.