Thirty monkeys crammed into crude wooden crates were found on the Tarmac at John F. Kennedy International Airport in New York, stranded in the cold by a suspected dealer in the black market pet trade, officials said. Eight of the monkeys were dead by the time they were discovered near a gate used by a Costa Rican airlines, where they were left late Tuesday night, said a spokesman for the American Society for the Prevention of Cruelty to Animals. “There were 30 monkeys left . . . in freezing cold conditions. They were in the most inhumane crates imaginable,” spokesman Jeffrey Hon said.