508 REVISION OF THE AUSTRALIAN SPECIES OF BOLBOCERAS, 



punctulatis (14^ 15^que antice contiguis sed vix inter se plane 

 commixtis), interstitiis planis ; tibiis anticis extus 6-dentatis, 

 posticis supra carinam apicalem transversim Icarinatis et hinc 

 sursum duplici serie tuberculatis. 



Femina a mari (ut supra scriptus) differt capitis et pronoti 

 sculptura; capitis sculptura a B. Macleayi (fern.) vix differt sed 

 puncturis magis subtilibus, eminentia frontali bifida magis lata 

 minus elevata; pronoto fex'e ut maris punctulato supra sat sequali 

 (parte antica retusa minus alta excepta), hac carina transversa 

 antrorsum arcuata quam capitis latitude longiori supra marginata, 

 angulis anticis baud mucronatis. Long. 9, lat, 5^1in. 



The male of this species is extremely different from those of 

 all the other described Bolbocerata except armigerum, Macl., 

 which latter species it resembles considerably, but differs in 

 respect of its head, inter alia, by the frontal elevation being a 

 single horn feebly bifid at the apex, and in respect of the pro- 

 notum, by the intermediate horns being of a twisted shape 

 difficult to describe exactly (they are convergent at the apex), 

 and by the foveae behind the intermediate horns being very much 

 deeper. 



The female can be at once separated from all the other described 

 females of the genus by the retuse front of its pronotum margined 

 behind by an arched carina, the convexity of which is directed 

 forivard, but I have before me other female Bolbocerata (of which 

 I do not know the males) which present the same character. The 

 female of B. tenax differs from one of them (which I suspect of 

 being the female of B. ingens, Macl., by the transverse carina of 

 the pronotum being extended laterally beyond the width of the 

 head, from another by the upper outline of the subvertical clypeus 

 (viewed from in front) being truncate instead of roundly arched, 

 and from yet another by the left mandible (viewed from above) 

 being scarcely sinuate instead of strongly emarginate. Both 

 sexes of this species differ from B. armigeriim, Macl., by their 

 front tibiae having only 5 external teeth. I have examined 

 several specimens of both sexes (in my collection and that of the 

 S. Australian Museum) and do not find the species variable, 



S. Australia. 



