I believe this is a White-lined Sphinx (Hyles lineata) Hodges #7894, http://mlbierly.smugmug.com/Moths/White-lined-Sphinx-Hodges-7894/13767152_wj XeQ#1007499828_2cQdQ. It was seen at Kentucky Manor, Nashville, Davidson County, September 13, 2010, on a sunny afternoon at 4:20 p.m., feeding on a variety of dangling buddleia. Michael Lee Bierly, Nashville, Davidson County, TN.