"11. S. progressa.
Medium 1.15 by .45; costae, 10, narrower than interspaces; cream-white much mottled on interspaces with pale brown. North end of Great Guana Key near Black Point. Very abundant on shrubs and other plants Evidently an old species. 1738 Plate 2, figs. 1, 2, 3." (Maynard and Clapp in Maynard, 1920d:119).