REVISION OF THE GENUS HETERONYX, WITH DESCRIPTIONS OF NEW SPECIES. By the Rev. T. Blackburn, B.A., Cork. Mem. Linn. Soc. N.S. W. Part IY. The present memoir carries on my revision of Heteronyx to the end of the genns. In order to make this portion (Part IV.) of the work as far as possible complete in itself in respect of the species it deals with, I must remind the members of the Linnean Society that for the purpose of my work I have proposed to divide Heteronyx into 3 main divisions (or " Sections "), the 1st con-taining those species in which the labrum is altogether below the plane of the clypeus and invisible from above (as in most Melolon-thidce) ; the 3rd containing those species in which the labrum is dilated and directed upwards in such manner that its summit rises above the plane of the clypeus ; and the 2nd containing species in which the relation of labrum and clypeus is intermediate between those indicated above. I have now to deal with the last part of the 3rd Section. I subdivided it into groups of species having 8-jointed antennae (already dealt with), and those having 9-jointed antennae. The latter of these groups I have subdivided according as the claws are bifid (already dealt with) or appendiculate. The present memoir deals with those species whose claws are of the last-named form. In the course of a few months I hope to be able to offer to the Society an appendix treating of a number of species that have come into my hands during the issue of this " Revision" but too late to be included in the sections to which they belong, and also discussing those species previously described by other authors which I have failed to identify.