Mats Hallin and John Tonelli scored 64 seconds apart in the third period last night in Uniondale, N.Y., to rally the New York Islanders to a 5-3 victory that kept the Philadelphia Flyers from moving ahead of Washington atop the Patrick Division.

The third-place Islanders trail Washington and Philadelphia by four points.

Hallin, a seldom-used forward from Sweden, skated unchecked from the right wing corner into the slot. Goalie Pelle Lindbergh stopped a wrist shot but Hallin poked in the rebound.

Tonelli's 25th goal of the season, a deflection of Gord Dineen's wrist shot at 17:50, won it. Mike Bossy scored his second goal of the game, 36th of the season, into an empty net with 28 seconds left.

Dave Poulin's breakaway goal midway through the third period had given the Flyers a 3-2 lead. Brian Propp assisted on all three Flyers goals.

Tim Kerr, the Flyers' leading scorer, made his 33rd goal of the season on Philadelphia's first shot of the game. The Islanders had outshot the Flyers by 7-0 before Kerr tipped home a feed by Poulin.

The Islanders got the next two goals, by Bossy and Brent Sutter. Bossy's 25-foot wrist shot from the right circle beat Lindbergh, and Sutter made it 2-1 with a backhander over the prone goalie with 15 seconds left in the first period.

Flyers defenseman Mark Howe bruised his upper chest and clavicle in the first period and will be X-rayed when the club returns to Philadelphia. He was hit from behind and slammed against the boards behind Philadelphia's net. He went to the dressing room and did not return to the game.