Resident students at Columbia University will be allowed to have women in their rooms during the evening for the first time as a result of new parietal regulations announced this week by the college.

Beginning a wek from today, parietal hours will be instituted on Saturday evenings from 7 p.m. to midnight. Previously, women visitors had been allowed in the dormitories only on football Saturdays from 5 p.m. to 8 p.m. and on alternate Sundays from 2 p.m. to 5 p.m. The longer Saturday hours, however, will replace entirely the Sunday privileges.

The new rules apply to more than 1800 undergraduates and graduates living in six dormitories. Students will still be required to keep their doors open when entertaining women, consistent with a precedent established by the university last March when it first established parietal hours.

"The broadening of our program has been granted on the basis of the success of the more limited plan," Lawrence H. Chamberlain, vice-president of the university, said Wednesday. "On the basis of information available to me from the Dean's office and from the Director of Residence Halls, I have the impression that the trial program has worked well."

Brown is now the only Ivy League college without evening parietal hours.