Two 18-year-old men have been arrested and charged in the theft of two Washington County monkeys earlier this week.

Charged were Steven Christopher Labore of Vestaburg, Washington County, and Michael Anthony Naylor, of Rices Landing, Greene County.

Each is charged with burglary, theft, criminal trespass and criminal mischief, according to a news release from the Washington barracks of the Pennsylvania State Police.

Mr. Labore and Mr. Naylor were arraigned by Magisterial District Judge Curtis Thompson of Bentleyville, who set bond at $20,000 unsecured for each of the men.

The monkeys were stolen early Monday morning from the Somerset Township compound owned by Grant L. Kemmerer III and his wife, Jamie. The own and operate Wild World of Animals, an educational program. They have about 80 exotic animals.

Though the guenon monkeys were returned about seven hours after their abduction, they are showing some signs of stress as a result of their ordeal, according to their owner.

"Gwendolyn bit Lucy on Wednesday, which is unusual because they always get along really well," Mr. Kemmerer said yesterday. "Gwendolyn is stressed, which is why she acted aggressively. But they're resilient animals, and I expect them to be fine soon."

Gwendolyn, 14, is a 12-pound spot-nose guenon. Lucy, 5, is a seven-pound mona guenon. The Kemmerers have owned them since they were infants. Changes in environment are very stressful for wild animals, Mr. Kemmerer said.

A woman called Mr. Kemmerer on Monday at about 8:30 a.m. to say she knew the location of one of the monkeys and was trying to locate the second monkey, which had been sold. About an hour later she called back, said she had both monkeys and arranged to meet Mr. Kemmerer at a gas station where she and a teenage boy returned the monkeys and sped off.

The woman said teenagers broke into the compound because they heard there was marijuana growing in a greenhouse. They found no marijuana, just tropical and semitropical fruits grown by the Kemmerers to feed their exotic animals. Three animal cages were broken and two monkeys were missing, Mr. Kemmerer discovered at 2:30 a.m. Monday, when he went to investigate an open door in the greenhouse.

Guenon monkeys are native to parts of sub-Sahara Africa.

State police said they received tips that lead them to Mr. Labore and Mr. Naylor. Police said each of the men gave written statements to police, implicating themselves and each other.