disgusting butterfly (swallowtail)

As the choir began a hymn, some of the singers began to make strange faces and cover their noses with handkerchiefs. The priest, as he walked to the altar, sneezed loudly and cleared his throat. The people in the first few rows of the congregation turned to each other with puzzled looks. The women began vigorously fanning their faces with their church programs. The children started squirming and pinched their noses. Little by little the strange behavior began working its way toward the back of the church.