An article yesterday incorrectly characterized the pleas of Robert M. Krohn, Catherine Lee Scarborough and Mauro Pasqualucci, all of Annapolis, in a case in U.S. District Court in Baltimore involving the illicit drug methamphetamine. Krohn pleaded guilty to conspiracy to manufacture the drug. Pasqualucci and Scarborough pleaded guilty to conspiracy to distribute the drug.

Three Annapolis persons accused of conspiring to operate an illicit drug laboratory in an elegant Victorian-era farmhouse in Anne Arundel County have pleaded guilty to the charges in federal court here.

Robert M. Krohn, 28, owner of an Annapolis T-shirt and bumper decal shop, along with his girlfriend, Catherine Lee Scarborough, 27, and Mauro Pasqualucci, 28, admitted before U.S. District Court Judge Alexander Harvey II that they conspired to manufacture methamphetamine, a potent synthetic stimulant known as "speed" on the street.

They entered guilty pleas on Aug. 1, the day they were scheduled to go on trial. No sentencing date has been set. Each faces a maximum penalty of five years in prison and a $15,000 fine.

Krohn's decal business partner, John Dinsmore Bigger III of Annapolis, also has been indicted on conspiracy charges in the case and is awaiting trial. A fifth defendant, Jack D. Holt, 35, of Leesburg, Va., pleaded guilty last month to a charge of unlawfully transporting a bomb device in connection with the case.

Krohn, son of a widely known Annapolis lawyer, was originally arrested last January after Anne Arundel County police, searching for a missing person, stumbled across what they said was a well stocked "meth" lab in Krohn's $354,000, turn-of-the-century farmhouse near rural Davidsonville.

Krohn was released on personal bond at the time. He was kept under periodic surveillance by Drug Enforcement Administration agents and rearrested four months later on charges of conspiring with an undercover agent to set up another meth lab.

DEA's Baltimore chief, George B. Brosan, said Krohn sold his meth formula to the undercover agent for $5,000 after being led to believe the agent was a drug dealer who could manufacture the synthetic drug at a another laboratory replacing the seized lab in Davidsonville.

Scarborough and Pasqualucci were arrested with Krohn. Holt was arrested separately and charged with manufacturing a bomb that he intended to use to booby trap Krohn's new "lab" in case authorities discovered it.

In addition to the farmhouse and surrounding land, federal agents seized a $112,000 printing press at Krohn's Atlantic Decal shop in Annapolis, claiming it was purchased with profits from his illicit lab and thus subject to public auction.