Glenn C. Loury, the leading contender for undersecretary of education and a prominent political economist, pleaded not guilty yesterday in Boston Municipal Court to charges that he assaulted a 23-year-old woman. The Department of Education said Loury withdrew his name Monday from consideration for the second-highest position at the agency.

Loury, a professor at Harvard University's John F. Kennedy School of Government, was arraigned before Judge Walter Hurley after turning himself in to authorities yesterday.

The Suffolk County district attorney's office had issued a warrant for his arrest after Pamela Foster, who listed a Boston address, filed a complaint with Boston police Thursday morning. She alleged that Loury had kicked and threatened her during an argument the previous night.

Loury is scheduled to return to court July 9 for a hearing.

Police and court authorities said they did not know the nature of the relationship between Loury and Foster, who listed her occupation as radio announcer.

Loury, 38, lists on his resume a Cambridge address, where he lives with his wife, Linda. Boston directory assistance lists an unpublished phone number for Glenn C. Loury at the address where Foster told police she lives, and a source confirmed that Loury kept an apartment there.

Loury could not be reached for comment. His attorney, Martin Gideonse, said Loury would not speak to reporters.

Loury, who is black, has become well known as a conservative advocate of self-sufficiency among disadvantaged minorities. He has opposed quotas and other preferential treatment, arguing that blacks should not rely on government assistance to improve their status.

His name had been made public in March as the likely nominee for education undersecretary. An official announcement of the nomination was awaiting routine background investigations, according to Education Department officials.

William Kristol, chief of staff to Education Secretary William J. Bennett, said Loury called the deparment Monday and cited "personal reasons" for withdrawing his name.

"We first learned of the allegations concerning Mr. Loury from press calls Thursday evening. And we have no independent knowledge of these allegations or any comment on them," Kristol said in a statement.