Two larval stages of "Strongylosoma guerinii" (="Oranmorpha guerinii" (Gervais, 1836). At left, the larva is still surrounded by the cuticular envelope which bears the egg-tooth ; at right it has shed this envelope and has entered upon its free life. "at" antenna, above and posterior to which the egg-tooth can be seen ; 3, 4, 5 the three pairs of legs.