At the request of Mr. Ritsema I give here the description of a new Ichthyurus from Eastern Java, belonging to the collections of the Leyden Museum. The species of Ichthyurus at present known as inhabiting the island of Java are very few in number, and I have to thank Mr. Ritsema for entrusting me with the study of a very remarkable form of this highly interesting genus of Malacodermidae.