376 RiicoKDs or the S.A. Museum 



an obtuse riclge (the space between the two ridges gently eoneave) ; \vi1li large, 

 coarse punctures on sides, smaller and sparser, but still large, elsewhere, but 

 absent from the excavations; median line rather wide and shallow; gutters fairly 

 deep on sides, shallow at base. Elytra deeply and narrowly striated, the inter- 

 stices separately distinctly convex, and Avith large punctures, usually with an 

 oblique or transverse impression. Metasternum shagreened, and with rather 

 small, asperate punctures on sides, middle shining and with small punctures, but 

 with a few large ones near coxae. Two apical segments of abdomen strongly 

 narrowed to middle ; pygidium with large and small punctures intermixed. Front 

 tibiae long, thin, and strongly arched near apex. Length, 11 mm. 



Hob. Northern Territory: thirty miles east of Darwin (G. F. Hill). Type, 

 I. 15501. 



By its strongly narrowed apical segments of abdomen, and long front legs, 

 the type certainly appears to be a male, although the projections and excavations 

 of the pronotum approach those of some females of 0. conspicuus, and some 

 allied species; the elytra, however, are very different from those of 0. conspicuus; 

 from 0. tricavicollis it differs in the feeble interocular elevation, and considerably 

 larger and sparser elytral punctures ; the shape of the prothorax and its punctures 

 seem intermediate between those of the sexes of the latter species. Seen directly 

 from above, the prothorax appears to have two small tubercles and two larger 

 obtuse ones, the distance between the latter being equal to that between the eyes; 

 viewed from behind, so that the head just disappears, the front appears to be 

 5-sinuate, the median sinus twice the width of each of the intermediate ones, and 

 these much wider than tlie lateral ones. 



ONTHOPHAGUS SPISSICOLLIS sp. nov. 



Plate ix, fig. 75. 



? Black, subopaque, in parts with a bronzy gloss; basal joints of antennae, 

 parts of palpi and of tarsi obscurely reddish. Under-surface and legs with hairs 

 varying from almost white to dark brown; head and most of prothorax with 

 short, dense, upright, i)rownish setae ; elytra with paler, shorter, and sloping setae, 

 confined to one or two rows on each interstice. 



Head wide, densely and coarsely punctate and subvermiculate, except behind 

 interocular ridge, this acute in middle and strongly elevated at each side, but not 

 horned ; sides moderately elevated, slightly incurved at clypeal suture, and 

 conspicuously produced on each side of a deep apical notch; clypeal suture 

 trisinuate, finely carinated, the median portion feebh' arched forward, and 

 slightly elevated in middle. Eyes very narrow, facets distinct. Prothorax with 

 front angles obtusely produced, margins distinct throughout, but slightly higher 



