392 Records of the S.A. Museum 



punctures, aud larger ones cut across by striae. Metasternuin \vi1li large punc- 

 tures, becoming smaller but more sharply defined in middle. Abdomen with 

 apical segment sirongly narrowed in middle; pygidium with crowded and sharply 

 defined pun(;tures. Front tibiae rather long. Length, 4-5 mm. 



Hah. Northern Territory: Groote Eylandt (N. B. Tindale). Type, I. ir)407. 



Structurally near male of 0. quadripustulatus, although cephalic armature 

 not quite identical, but elytra with more distinct punctures and unspotted; from 

 the male of 0. hiarkhurni it is distinguished by the noncarinated clypeal siiture; 

 the male of (). s!/(])ie!jemis, also with the suture noncarinated, has the clypeus 

 truncated in front and impunctate; 0. hiackwoodensis has much larger pro- 

 thoracic punctures, head of male with one interocular elevation, etc. The front 

 angles of the prothorax from aliove appear to be rather acute, l)ut at right angles 

 are seen to be almost rectangular. 



ONTHOPHAGUS IMPONDEROSUS sp. nov. 



S Black, in parts with a slight bronzy or purplish gloss, legs and palpi 

 reddish, antennae ]ialer, sides of prothorax, most of elytra, and apical parts of 

 abdomen obscurely reddish. TTnder-surface and legs sparsely clothed. 



Head with a feebly elevated and almost straight ridge, almost touching the 

 eyes; with small but rather distinct punctures behind it, and somewhat smaller, 

 and sparser ones in front. Clypeus short, sides gently rounded and feebly 

 upturned, middle feebly incurved and not more upturned than sides; punctures 

 small and ill-defined, suture carinated and straight from side to side. Eyes 

 narrow, with distinct facets. Prothorax wide and evenly convex, sides with 

 narrow gutters and margins, apex more feebly margined, base scarcely visibly so ; 

 punctures of moderate size, nimierous but not crowded, and sharply defined. 

 Elytra with narrow striae; interstices not separately convex, with numerous small 

 ]iunctures, becoming larger on sides, where they are almost as distinct as those 

 on prothorax. Metasternum with sharply defined punctures, larger on sides than 

 elscAvhere. Abdomen with apical segment distinctly narrowed in middle; 

 pygidium with slightly larger and more crowded punctures than on prothorax. 

 Length, 2-5 mm. 



9 Differs in having slightly larger punctures and apical segment of 

 abdomen not narrowed in middle. 



Hah. Northern Territory: f4roote Eylandt (N. B. Tindale). Type, 

 I. 15409. 



Smaller than any other species in the IMuseum, and apparently the size of 

 0. (jran 11)11, l)ut clul) not dark, and clypeus scarcely emarginate, even in the 

 female. The female has the elytra, except for a large space about the scutellum, 



