Two 24-year-old Maryland men were arrested last night and charged in the Sunday morning abduction and sexual assault of two University of Maryland students, campus police said.

Police said two men -- neither of them university students -- abducted the students from a fraternity party near Rte. 1 on the College Park campus about 3 a.m. Sunday, and, while driving around the Capital Beltway, raped one woman and sexually assaulted the other. The men allegedly returned the women to their dormitories before fleeing.

Campus police said they learned the identity of the men by checking a log kept by a security guard at the dormitory parking lot. The guard routinely records the license plate numbers of cars driven by persons without student identification. Campus police arrested two men, with the help of the Bladensburg police department, at 6:15 p.m. yesterday.

The suspects were identified as Leonard Baldwin of 4205 58th Ave. in Bladensburg, where the arrests were made, and Frederick Balachos of Baltimore. They were charged with kidnaping, rape and assault with attempt to rape and were being held last night without bond at the Prince George's County Detention Center.

Sunday night's rape was the fifth reported at the College Park campus so far this school year, compared with three in all of 1979, according to an editor with the Diamondback, the campus newspaper. The editor also noted that a recently released FBI survey ranked the University of Maryland fourth among American college campuses in the incidence of violent crime.