A former teller for the Suburban Trust Co's Takoma Park branch, her husband and a former D.C. policeman were convicted by a U.S. District Court jury yesterday of conspiring to rob the bank earlier this year. Two other men were aquitted.

The bank at 6950 Carroll Ave. was robbed April 18 by a woman who presented a note to the teller, Wanda Jean Goudine Qualls, 21, and walked away with a canvas sack containing $18,810, according to the FBI.

At this week's four-day trial, prosecutors said that before the holdup, the teller; her boyfriend, Ronald Qualls, 23, of Washington, whom she married this summer, and Ferdinand Terry Moore III, 25, a former Washington policeman, along with two other men, discussed holdup plans, arranged two getaway cars and recruited another woman to hand the note to the teller.

That woman, Karen Peterson, 20, of Washington, made a deal to avoid prosecution, according to prosecutors, and testified against the defendants at the trial.

The defendants and their attorneys argued that robbing the bank was discussed, but that the five were unable to agree on a method. They said Peterson used a note that Moore had typed on the back of a withdrawal slip - just to see how it looked - and robbed the bank herself without their knowledge.

The jury acquitted two of the defendants: Gregory Harvey, 24, of Adelphi and Fabrel Hopton Moore, 24, brother of Ferdinand Terry Moore.

Sentencing of the others was postponed pending a presentence report.