Lea — Australian Dung Beetles 367 



5. Tnterociilar ridg'o areliod forwards, but its sides not elevated into horns or 

 tubercles, clypens evenly arched, except that its middle is truncated ; prothoracic 

 protuberance verj' feeble, no depression in front of it. Bowen (Queensland). 



6. As o, but clypeus with two projections in front. Connexion Island 

 (Northern Territory) and Derby (North-western Australia). 



All these forms have the eyes large, without distinct facets, clypeal carina 

 almost evenly arched backwards with the middle slightly elevated, prothorax with 

 shallow but not very small piuictures, distinct on the feebly-armed specimens, 

 tending to obliteration on the strongly-armed ones, with margins distinct through- 

 out, and elytra shagreened and opaque. 



ONTHOPHAGUS DUNNINGI Har. 



Plate ix, figs. 68, 69. 



A rare species, which appears to live solely in agaric fungi ; the horns on the 

 head and prothorax of the male A^ary considerably in length. 



ONTHOPHAGUS HAAGI Har. 



Plate viii, figs. 42-44. 



A very distinct species, but varies greatly in size; on the female the inter-' 

 ocular ridge is sometimes moderately elevated and interrupted in middle, some- 

 times strongly elevated and almost even throughout, on others with a conspicuous 

 process (almost a horn) on each side of it; the horn on the head of the male 

 varies in length, but its summit is always distinctly bifid. 



ONTHOPHAGUS FEROX Har. 



Plate vii, figs 23, 24. 



On some specimens of this species the cephalic horn is little more than a 

 short conical tubercle, on others it is much longer and rises well above the level of 

 the pronotum ; the prothoracic horns also vary greatly in length and acuteness. 



ONTHOPHAGUS PENTACANTHUS Har. 



Plate vii, figs. 25, 26. 



The median processes of the prothorax and the cephalic horn of this species 

 vary in much the same way as do those of 0. ferox. 



