The genus Cophotis was established by Peters for an Agamid from Ceylon and his species, Cophotis ceylanica, must be rare and very locally distributed in that island, according to Günther. The latter author gives a detailed description and an excellent figure of the animal in his Reptiles of British India. A specimen very closely allied to the Ceylon species has been forwarded to our Museum from Sumatra; it differs however in enough important respects from its Ceylonese namesake to permit a specific distinction. In order to facilitate a comparison the points of difference with Cophotis ceylanica are printed in italics.