I realize that this posting is from 2002, however just in case you have not determined the ancestry of William Adams Delano yet, here is what I was able to find:
According to the book "The Genealogy, History and Alliances of the American House of Delano" (GHAAHD), p. 523-524, this line is an unknown Delano line. This just means that the compiler of GHAAHD was unable to connect this line to Philippe De La Noye. Here is the gist of what GHAAHD has on this line:
William Adams Delano, b. 21 Jan 1874, son of Eugene Delano, b. abt 1843 in NY, m. Susan Magoun Adams, son of Moreau Delano, b. ??, d. 1870 in New York City, NY, m. Sarah Ann Abrams, son of Obadiah Delano, b. ??, d. before 1850, m. Asenath Metcalf, b. 1773, daughter of Jonathan and Zilpha Metcalf.