301 



acuticeps, Mad., and 

 propinquus, Mad. 



F. Pronotum very finely punctulate ... ■ 



FF. Pronotum coarsely punctulate. 

 G. Size large (Long , 6 1.); front of 



clypeus emarginate 

 GG. Size much smaller (Long., 

 3^ 1.); front of clypeus not 

 emarginate 

 EE Dorsal surface more or less metallic. 

 F. Ketuse front of pronotum quadri- 

 tuberculate (male with a single 

 frontal horn) 

 FF. Betuse front of pronotum not 

 quadrituberculate. 

 G. Size comparatively large (Long., 



44].) ... 

 GG. Size much smaller (Long.. 2| 1.) 

 DD. Front of pronotum not retuse. 

 E. Dorsal surface non-metallic 

 EE. Dorsal surface more or less mecallic. 

 F. Elytral interstices opaque 

 FF. Elytral interstices notably more 

 nitid. 

 G. Alternate interstices of elytra 



convex ... 

 GG. Interstices of elytra equal inter 



St. 



H. Pronotum coarsely punctulate 

 HH. Pronotum finely punctulate 

 BB, Dorsal surface with red or testaceous 

 markings. 

 C. Pronotum bicolorous 

 CC. Pronotum unicolorous. 



D. A conspicuous black fascia on the red 



elytra 

 DD. Shoulders, sides, and an apical spot 



on elytra red 

 DDD. Elytra with only the shoulders red 

 DDDD. Obscure reddish spots about 

 shoulders and apex only. 

 E Male with a frontal lamiaa and horns 

 EE. No strongly raised frontal promi- 

 nence in either sex ... 

 N.B. — I am unable to place 0. tabellicornis, Macl. 

 Macl., even in this tabulation. 



O. rupicapra, Waterh. A very large species from W. Aus- 

 tralia ; the elytra clothed with setse, the male with two discon- 

 nected frontal horns. I have seen nothing like it. 



O. perpilosus, Macl. A small black species from Queensland, 

 densely pilose on the upper surface ; interstices of elytra costi- 

 form, the under surface also villose. I have not seen any species 

 resembling it. 



O. incanus, Mad. A small species from far North of W. 

 Australia ; bronzy black, coarsely punctulate and densely clothed 

 with erect grey pubescence. Very distinct from all the species 

 before me. 



fissiceps, Mad. 



salebrosus, Mad. 



Crotchi, Ear. 



lucidicollis, Bohem. 

 purpureicollis, Mad. 



parallelicorais, Mad. 



evanidus, Har. 



planicollis, Har 



granum, Lansb. 

 viridiobscurus, Blanch. 



rubescens, Mad. 



minusculus, Mad. 



Fabricii, Waterh. 

 humeralis, Mad. 



emarginatus, Mad. 



incornutus, Macl. 



and 0. iategriceps. 



