426 REVISION OF THE GEXUS HETERONYX, 



this inward projection being quite pronounced, while the apical 

 piece is very small, these two {i.e., the inward projection or "tooth" 

 of the basal piece and the apical piece) are not very different from 

 each other in size and the claw has a bifid appearance. Although 

 it does not appear to me really accurate to call this form of claw 

 " bifid," nevertheless as it has been so called by former describers 

 I have thought it better to retain the word in the Latin diagnoses. 



I have also included in this subgroup such species (they are 

 very few) as have the claws ahnorinal, the appendiculation being 

 extremely minute and placed close to the tip of the claw, so that 

 the apical piece is only a quarter or thereabouts of the size of the 

 basal piece. Thus, the following will be the definition of the hind 

 claws in the species forming this subgroup: — ^'the basal piece 

 ending internally in a well defined process at least half as large as 

 the apical piece, or the appendiculation quite minute and apical." 



Tabidation of the species of Heteronyx having the labrum over- 

 topping the plane of the clypeus, th^^ antennae 9-jointed, and the 

 claws as specified above. 



A. Hind coxse not, or scarcely, shorter than 

 lateral suture of metasternum 



B. Anterior tibiae distinctly tridentate ex- 

 ternally 



C. Surface of elytra normal 



D. Middle lobe of trilobed outline* 

 much narrower than the lateral 

 lobes .- Darwini, Blackb. 



DD. Middle lobe of trilobed outline 

 very little narrower than the 

 lateral lobes incola, Blackb. 



CC. Surface of elytra with wide feeble 



costse 



* Vide antea p. 139. 



