Half a year after the nation’s capital bid an emotional farewell to its giant pandas, the National Zoo is expecting a renewed surge in panda-mania with the announcement that two more of the furry black-and-white icons will be returning to Washington. The zoo announced Wednesday that a fresh agreement had been struck with the Chinese government, and a pair of adult pandas would be arriving by the end of the year. The zoo said the incoming pair are Bao Li and Qing Bao. Giant pandas are icons in Washington and beloved around the nation and the world. Pandas have been the symbol of U.S.-China friendship since Beijing sent a pair to the National Zoo in 1972.