I found this bug on a window screen. It looked like a spot of bird dropping but was walking and had antenna. The photos with grey background were taken after the bug was collected and was still fresh. The translucent shell allows it to take on the color of the object it is perched upon. The upper surface lookes etched. The photos with green background were taken today after the bug had dried out. They show the hump on the back. The bug brings to mind a flattened ladybug.