In a consignment of beetles, lately received from Mr. J. D. Pasteur and brought together by himself in Western Java (Mt. Poentjak, on the frontier between the districts of Buitenzorg and Preanger), I found among a fine series of Cladognathus giraffa Oliv. a specimen which was at once distinguished from the others by its more slender mandibles which were regularly curved downwards, and by the rounded, not obliquely truncate anterior angles of the prothorax. A more careful examination of this specimen showed me clearly that it had nothing to do with Cl. giraffa but that it was a very close ally of the interesting Prosopocoelus decipiens Parry ¹) from Malabar. The Javanese species is certainly undescribed and I propose to call it after its discoverer: