Brown frass (excrement) tube and chewing damage of palm leaf skeletonizer, Homaledra sabalella, larvae infesting cabbage palm, Sabal palmetto..
Credit: Mary Kleim, creativecommons.org/licenses/by-nc-sa/2.0/, original source http://farm9.staticflickr.com/8505/8442258707_e98b3925d0_o.jpg