Enclosed I send you some specimens (males and females) of an Ichthyurus-species captured by me on December 27th of last year at Poespo, about 600 M. above the level of the sea, on the slope of the Tengger Mountain (Pasoeroean Residency). These handsome beetles were flying round a young fig-tree Urostigma spec.), and, on examining the tree more carefully, I found them on the under side of the leaves. I was not able to make out what they were doing there, but I saw them stumble between the hairs of the leaves with their mandibles as it were in search of small insects, which, however, I could not detect with the naked eye. Ichthyurus flies very well, and it is especially remarkable how easily they take flight and sit down again, a fact which is very comprehensible on account of their keeping the wings straight when they are at rest. In handling these curious insects they bend the abdomen upwards just as the Staphylinidae and Forficulariae 2).