Three Genera of Papuan Pasaalid Coleoptera. 109 



outer tubercle is obsolete, so that this tubercle appears to be simply 

 pointed, and the head to be markedly asymmetrical. Tlie ridges joining 

 the inner tubercles to oneanother and to the outer tubercles are all obsolete 

 or entirelj absent. The rugosity of the anterior margin of the head is 



not quitt- sn extensive as in H. impar, and does not extend on tu the 



Fig. 21 

 [ead of Hyperplesihenus gracilis (HELLER). 



canthus. The parietal ridges are straight, and extend directly outwards 

 or a little forwards. The median groove of the pronotum may be either 

 complete or incomplete in front; the scars contain hair-bearing punctures. 

 The scutellum bears little or no trace of a median groove; it is punctured 

 as in H. gldber. The mesothoracic episterna resemble those of H.impar. 

 The scars ob the mesosternum are absent or obsolete. The posterior 

 intermediate areas of the metasternum may be smooth or more or Less 

 strongly punctured all over. The posterior parts of the hind coxae 

 are almost entirely smooth. The elytra are unpunctured as in H.impar. 



Genus Omegarius. Kuwert. 



Anterior margin of head not markedly asymmetrical. Antennae 

 with six well developed lamellae, all very loog and slender. Dentition 

 of mandibles variable: when reduced. the reduction is more marked mi 

 the left than on the rieht side. Scars on mentum semicircular, facing 

 forwards. forming together a a> - shaped figure. Type. 0. pumüio (KAUP . 



KüWEET recognises two species of thisgenus, one from the Moluccas, 

 and one from New Guinea; but the characters by which he distinguishes 

 them are variable. I have seen a number of speeimens from the Moluccas, 

 New Guinea and New Brittain, some labelled with one name. and some 



