280 



emarginato, cum froiite confertim fortiter ruguloso ; 

 prothorace quam longiori duplo latiori, antice quam pos- 

 tice haud angustiori, supra confertim subtilius punctu- 

 lato, lateribus (superne visis) leviter sinuatim arcuatis 

 angulis anticis acutis sat productis posticis (superne visis) 

 sat acute rectis, basi margin ata utrinque parum sinuata ; 

 scutello crebre sat subtiliter punctulato ; elytris crebre sat 

 subtiliter (hie et illic subseriatim) punctulatis ; pygidio 

 pernitido, gros&e crebrius punctulato, obsolete carinato ; 

 tibiis anticis extus minus perspicue dentatis ; tarsis anticis 

 quam tibiae paullo longioribus,, posticorum articulo basali 

 quam 2"^ vix longiori ; coxis posticis quam metasternum 

 plus quam duplo brevioribus ; segmento ventrali apicali 

 per pygidium (hoc subtus flexo) profunde emarginato ; 

 corpore subtus fortiter punctulato. Long., 4^ 1. ; lat., 

 2i 1. 



The pygidium strongly bent under the body and causing 

 the apical ventral segment to be strongly emarginate seems 

 to indicate the unique specimen before me of this insect to be 

 certainly a male. In the other males known to me of the 

 genus a similar structure is slightly discernible (as compared 

 with the structure of the same parts in the specimens which I 

 judge to be females of the genus). I have not found in it 

 any other character likely to be sexual on account of its being 

 common to the other males and not to the females known to 

 me of the genus. There is an almost obsolete blunt tooth on 

 the external margin of the front tibiae slightly above the 

 apical projection. The elytra present slight indications of 

 geminate sculpture in a tendency of the punctures to fall into 

 pairs of traceable rows, — the pairs being separated by inter- 

 vals in which there is no trace of seriate arrangement, but 

 this character in the sculpture needs to be looked for, being 

 very inconspicuous. The species is very isolated among its 

 congeners by many characters, — form of labrum and clypeus, 

 comparatively fine puncturation of dorsal surface, etc. 



Western Australia: Coolgardie. Taken, I believe, by my 

 son. 



0. porosiis, sp. nov. Breviter late ovalis ; sat nitidus ; subgla- 

 ber ; piceo-niger, antennis palpisque rufis ; illis 9-articula- 

 tis, flabello 3-articulato quam articuli praeoedentes 5 

 conjuncti manifeste breviori ; labro sat magno parum pro- 

 ducto (hujus altitudine quam clypei frontis pars supra 

 majori) ; clypeo antice rotundato, cum fronte grosse sat 

 crebre punctulato ; prothorace quam longiori duplo 

 latiori, antice parum angustato, supra sparsim sat grosse 

 punctulato, lateribus (superne visis) leviter sinuatim 



