The lion-tailed macaque ("Macaca silenus") and Nilgiri langur ("Semnopithecus johnii") are endangered endemic primate species. Maenads, along with Bacchus and Silenus, appear in C. S. Lewis' "Prince Caspian". On the eleventh day, Midas brought Silenus back to Dionysus. Bacchus then arrives, searching for Silenus. Dionysus discovered that his old school master and foster father, Silenus, had gone missing. The tutor of Dionysus is represented by a single aged Silenus. A third story, refers to the presence there of many lion-tailed macaques "Macaca silenus". "Silene" is the feminine form of Silenus, a Greek woodland deity. Via Schopenhauer, Nietzsche discusses the "wisdom of Silenus" in "The Birth of Tragedy". Silenus joins Sad King Billy on Hyperion. The second describes the love affair between Silenus and the nymph Syrinx. The passage IX.317 is in dialogue form, based on the dialogue between Hermaphroditus and Silenus. A prominent statue of Marsyas as a wise old silenus stood near the Roman Forum. These satyrs are always led by Silenus, who is their "father". In the 1880s he wrote three long narrative works, "Pygmalion", "Silenus" and "Tiresias".