Here's another bit of information. The following family appears in the 1930 census of Maine.

ARBOUR, Angus Head 65 Canada-Fr 1890 Caretaker, Private Family ME Kennebec Augusta T626_833 3 18A
ARBOUR, Esther L. Wife 57 Maine ME Kennebec Augusta T626_833 3 18A
ARBOUR, Lawrence Son 10 Maine ME Kennebec Augusta T626_833 3 18A
ARBOUR, Philip Son 8 Maine ME Kennebec Augusta T626_833 3 18A

If appears they moved to Maine from Quebec. Maybe not related at all, but I was intrigued to hear about another Angus. The 1919 marriage of a son, Roland, appears in the microfilmed Maine Vital Statistics, along with the information that this Angus was born in "Bonivantur, Canada". Could the Quebec Arbours and the New Brunswick Arbos be related or is this just coincidence?