In the 1880 PA census (East) there are two Delbo families, both in Lancaster Co. PA.: Darius and Samuel. Samuel is 33 (b. PA); his wife is Martha 29 and the children listed are Harry 11, Arthur H. (sic), and Ida 4. The reference for Samuel is Lancaster Co., PA, Warwick Township, volume 43, Enumeration District (E.D.) 119, sheet 36, line 25. The reference for Darius is (same Co. and Township) volume 45, E.D. 162, sheet 18, line 16. Hope this is of help in your searches.