278 Mr. F. Bates' Descriptions of 



more strongly punctured, antennary orbits longer, the sides 

 more thickened and more reflexed, and canalicidate within 

 the thickened border ; epistoma a little shorter, distinctly 

 foveately impressed at each side, the edges thickened and 

 a little reflexed, broader in front, the sides more dis- 

 tinctly marked off" from the antennary orbits, the suture 

 much more distinctly marked ; prothorax relatively much 

 Avider in proportion to its length, more regularly rounded 

 and less sinuous at the sides, the apical emargination 

 simple (not sinuous as in Iccvis), the fore angles less 

 prominent, less acute, and directed forwards (not out- 

 wards as in Icevis), the hind angles somewhat less pro- 

 duced, less acute, the lateral marginal grooves broader : 

 elytra wider, more broadly rounded at the shoulders, very 

 slightly depressed on the back : prosternal process broader 

 behind : legs shorter and stouter, the four posterior tibise 

 without any trace of a tomentose line on their under face. 



Hab. — West Australia. A single examjole captured by 

 Mr. Duboulay. 



May this possibly be *a sexual form of the typical 



O. opacus, n. sp. 



Long. 7 lin. ; elytra lat. 3j- lin. — Oblong, subparallel, 

 black, opaque ; head as in Icevis, but the sides of the epi- 

 stoma are still more completely continuous with the sides 

 of the antennary orbits, the suture being obsolete at the 

 sides : the antenna3 are a little more robnst, the joints 

 (especially the third) shorter, the outer ones more de- 

 cidedly perfoliate, 8-10 subcupidiform ; last joint of the 

 maxillary palpi very briefly cultriform ; prothorax more 

 transverse, squarer, sides not nearly so strongly narrowed 

 anteriorly, margins less thickened, middle of base more 

 distinctly truncated, angles much less prominent and less 

 acute ; elytra less strongly convex, sides subparallel from 

 near the humeral angles, more abruptly declivous behind ; 

 gular furrow more strongly marked ; prosternal process 

 abruptly contracted behind the coxie ; legs as in the pre- 

 ceding. 



Hab. — West Australia, Champion Bay. A single ex- 

 ample captured by Mr. Duboulay. 



At once to be distinguished from the preceding by its 

 opacity, squarer prothorax, and parallel-sided elytra. 



