REVISIOiSr OF THE GENUS HETERONYX, WITH 

 DESCRIPTIONS OF NEW SPECIES. 



By the Rev. T. Blackburn, B.A., Cork. Mem. Linn. Soc. N.S.W. 



Part III. 



The Beteronyces still remaining to be treated form the 2nd 

 group of the 3rd of the main divisions into which I have cut up 

 the genus for the convenience of this memoir, but which divisions 

 it will be remembered I do not set forth as at all capable of being 

 regarded as sub-genera, being well aware that if such a grouping 

 were possible (which it has not been to me) it would have to 

 follow very different lines. This (my Section III.) consists of 

 species having the summit of the labrum overtopping the plane of 

 the clypeus, and I subdivide it into two groups distinguished by 

 having 8- and 9-jointed antennae respectively. The former of these 

 groups was treated of in Parts I. and II. of my revision, and I have 

 now to enter upon the revision of the 2nd group. As in the case 

 of the former I again subdivide the group into two subgroups, one 

 having the claws bifid, the other having them appendiculate. The 

 present Part of the Revision deals with the species having bifid 

 claws. As a rule there is at most not much difference between 

 the claws on the various tarsi, — but nevertheless to make the 

 characters more reliable I base them in each instance on the claws 

 of the hind tarsi. Strictly speaking the claws of all Heteronyces 

 are appendiculate and the differences among them are of degree 

 only. The differences consist chiefly in the extent to which the 

 basal piece of the claw is angularly produced, or dentate, at its 

 inner apex. In general, the larger the basal piece in proportion 

 to the apical the more pronounced is the inward projection of the 

 former, so that there are a certain number of species in which, 



