DePauw University severed its ties today with a national sorority that evicted two-thirds of the university’s members last year in what the sorority called an effort to improve its image for recruitment, but which the evicted women described as a purge of the unattractive or the uncool.

“We at DePauw do not like the way our students were treated,” DePauw’s president, Robert G. Bottoms, said in a letter to Delta Zeta. “We at DePauw believe that the values of our university and those of the national Delta Zeta sorority are incompatible.”

The sorority evicted 23 members of its DePauw chapter in December, and half a dozen other women later quit in protest. The action greatly diminished the chapter’s diversity. The women the sorority allowed to stay were all slender and conventionally pretty. Those evicted included some overweight women, and several minority members were evicted or left the sorority on their own.

In an interview, Dr. Bottoms said that beginning this fall Delta Zeta would no longer be permitted to house students in its Greek-columned residence on the DePauw campus in Greencastle, Ind. Only a handful of undergraduates are currently living in the Delta Zeta house, and four of them are seniors, Dr. Bottoms said, adding that the university would help any women who had been planning to live in the residence next year to find alternative housing.