Ernest Kevin Jones, 21, was convicted in D.C. Superior Court yesterday of second-degree murder in the slaying of a Howard University student during a 1979 armed robbery attempt.

He was acquitted of assault with intent to kill in the wounding of another student in the same incident.

Assistant U.S. Atorney E. Thomas Roberts contended in the trial that Jones was one of two men who approached Leonard Poulson, 19, and Baline Pitts, 19, both juniors at Howard, as the students sat in a car on the college campus on March 26, 1979.

During an attempted robbery of the students, Jones, of 1900 Ridge Place SE, shot and killed Pitts, of Dover, Del., and shot Paulson, of Baltimore, in both legs, according to testimony. Charles Barksdale, the other participant in the inciident, pleaded guilty to manslaughter and attempted armed robbery and testified for the government in the trial.

The revolver used in the shooting was taken by Jones during the armed robbery and testified for the government in the trial.

The revolver used in the shooting was taken by Jones during the armed robbery of a security guard several days before Pitts was murdered, according to evidence presented by the government.

Jones' Public Defender Service Lawyer, Ladd Levens, argued that the government had not proved his client committed the murder and that several government witnesses were not telling the truth.