This is interesting and I guess fits their future lacrosse ambitions more than America East. BU and Patriot League just down sound right together for me though.
http://www.cbssports.com/collegebasketball/blog/eye-on-college-basketball/19359227/boston-university-leaving-america-east-for-patriot-league
At non-Ivy schools, you need a cheat sheet to remember which league you're in for basketball, hockey, football (oops, maybe no football team), lacrosse. And then maybe the women's teams have a still-different alignment. "Boston" and "Patriot League" makes sense.