Three weeks ago, the University of Maryland women shot a blistering 67 per cent from the floor to stagger long-time nemesis Immaculata, 113-63.

But the fourth-ranked Terrapins (23-2) are the first to admit that that scientillating 50-point regular-season victory won't mean a thing when they face the Mighty Macs (13-9) in an AIAW Regional semifinal at West Chester State tonight at 6:30.

St. Joseph's (Pa.), ranked eighth with a 23-3 mark, meets 10th-ranked Montclair State (20-6) in the other semifinal at 8:30.

The winners play for the Eastern regional title tomorrow at 8:30 p.m.

Since this regional is one of the strongest, both the winner and runner-up in Saturday's final will advance to a field of 16, hoping for a berth in the national finals March 25-26 at UCLA.

The Terrapin win over Immaculata snapped a five-game losing skein to the Mighty Macs. But the one loss that the Terps must remember was a one-point Immaculata victory last year in the regionals.

Freshman Kris Kirchner, the Terps' leading rebounder at 6-foot-2, has been hampered with a hyperextended elbow but is expected to be at 90 per cent efficiency. Doreen Lefeled, one of Maryland's top defensive players, has recuperated from a stomach ailment and will play.

Tara Heiss (13.2 points and eight assists) is the key to the Terps' fast-break. Kirchner, Jane Zivalich and Betsy Bailey, all averaging 12 points per game, are the usual recipients of Heiss' slick passes.

Immaculata is led by 6-4 junior Sandy Miller (15.6) points and 10 rebounds) and 6-1 senior Denise Burdick (18.0 points).

St. Joseph's, which handed Maryland one of its two defeats this year, (North Carolina State was the other) relies on the ball-handling of Mary Sue McGarrity and freshman forward Debbie Descano.

Montclairs' Carol Blazejowsi, a 5-10 senior, is the nation's leading scorer with a 33.6 average. Just a few points short of 3,000 for her career, Blazejowski has a season-high of 54 points.