Unbeaten teams at the end of last season - Interscholastic Athletic Association of Maryland A Conference champion John Carroll (18-0) and Class 4A state champion Severna Park (20-0).
Minutes players must sit out without a substitute on each yellow card this season - up from three minutes each beginning with the team's fourth yellow card.
Local girls among 24 who have signed with Florida, which will begin playing women's college lacrosse next season.
Goals scored last season by McDonogh's top four returning attackers - Molly Fernandez, Katie Matz, Kitty Cullen and Colby Rhea.
Goals scored last season by Severna Park in 20 games.