A Massachusetts man is in critical condition after a snowmobile crash Friday night in northern Penobscot County. Duane Carter, 55, of Spencer, Massachusetts, was riding with a group in ITS 83, a portion of Swift Brook Road near Stacyville, when he and rider Keith Sanford, 47, of Benedicta both failed to make a corner, according to a statement issued Saturday morning by the Maine Warden Service. Carter, who was following Sanford, collided with the back of the Maine man’s snowmobile, Corporal John MacDonald wrote.