Unfortunately I do not know of any Longos or Donatos from Valguarnera. My granparents - Vincenzo Loggia and Rose Costello immigrated to Broooklyn from ther in the late 1890's. Some other families that immigrated from there to Brooklyn were Fulmino, Buscemi, LaRosa, and Perrotta. All immigrated to the Park Slope section of Brooklyn, and I am related to all in one way or another. I hope this information helps.

PS It is really a small world. My late brother, Nicholas, worked for Keyspan for over 20 years