Mr. E. Jacobson, of Semarang, Java, has kindly sent to me for determination a small collection of Dermaptera from Java. I am able to recognize twenty-seven species; none of these are actually new, but several are interesting and the female of Tomopyyia abnormis Borm. is described for the first time, this species being hitherto known only from de Bormans’ unique type in the Brunner collection, now in the Hofmuseum, Vienna.