368 Records of the S.A. Museum 



ONTHOPHAGUS PROMPTUS Har. 



The type of this species was almost certainly a female. Specimens of both 

 sexes were taken on Groote Eylanclt, and others before me are from Darwin and 

 Cape York. The male differs from the female in having the clypeus not trans- 

 versely vermicnlate, bnt with fairly dense and rather shallow punctures, the 

 prothorax wider, somewhat retiise in front and apical segment of abdomen 

 incurved to middle; the lateral margins of the prothorax are distinct, but the 

 base appears to be immarginate, unless separated from the elytra, Avhen a very 

 feeble margin may l)e seen. The eyes are narrow and with distinct facets. In 

 general appearance the species resembles 0. margaretensis on a large scale, but the 

 female diff'ers from the type (a female) of that species in having the clypeus 

 truncated in front, the interocular ridge less abruptly elevated and somewhat 

 sinuous, prothorax with smaller punctures, and median line well defined on at 

 least the basal half, instead of but feebly defined and close to tlie base only. 



ONTHOPHAGUS PLANICOLLIS Har. 



Plate ix, fig. 70. 



A specimen from Moa or Banks Island (near the original locality, Somerset) 

 evidently belongs to this species, as its elytra have the alternate interstices 

 'elevated and with rows of granules, but these granules and the large punctures 

 on the head and prothorax are each supplied with a stiff upright seta ; no setae 

 were mentioned in the description before me (a written copy of the original one), 

 .so that probably the type was abraded. 



ONTHOPHAGUS ANISOCERUS Er. 



0. fuligijwssus Er. 



Plate viii, figs. 45-47. 



In his table Blackburn separated these forms by the crenulations of the 

 'elytra, "distinctly punctiform" in 0. anisocerus and "not punctiform" in 0. 

 fuliginosus, but the specimens from his collection (now in the South Australian 

 Museum) do not warrant specific separation. Erichson apparently relied upon 

 the differences in colour and in the cephalic horns, but these are all variable, the 

 lateral horns are twice as long on some Tasmanian specimens as on others, and 

 the median process varies from feebly elevated and scarcely double to strongly 

 elevated and conspicuously bifid, so that I cannot regard 0. fuligmosus as deserv- 

 ing even of a varietal name. Two males, from the Queensland National Park, have 

 the lateral horns longer than usual, with the median process in the form of a 



