278 



A. Elytra non-setose. 



B.* Labrum small, scarcely projecting 

 from front face of head, its summit 

 very distant from summit of front 

 face of head. 

 C. Basal edging of pronotum very dis- 

 tinctly thickened and more elevat- 

 ed at its ends. 

 D. Clypeus evenly rounded in front 

 DD. Clypeus truncate in front 

 CC. Basal edging of pronotum uni- 

 formly fine ... 

 BB. Labrum much larger, distinctly pro- 

 m.inent, its summit not much below 

 summit of front face of head. 

 C, Clypeus in front widely and very 

 feebly emarginate. 

 D. Basal declivity of pronotum ni- 

 tid and almost punctureless (a 

 row of punctures close to basal 



edging) ... 



DD. Basal declivity of pronotum 

 punctured scarcely differently 

 from the rest of the surface 

 CC. Clypeus in front deeply angularly 

 emarginate ... 

 BBB. Labrum (viewed from above) 

 scarcely prominent, but its summit 

 near summit of front face of head 

 AA. Elytra setose 



fallax, Blackh. 

 lepidus, BlacJcb. 



lugubris, Blackb. 



suspiciosus, Blackb. 



spinicollis, Blackb. 

 scissiceps, Blackb. 



porosus, Blackb. 

 decipiens, Bnrm. 



0. lepidus, Blackb. I have recently received two female 

 specimens of Ocnodus taken by Mr. Perkins in Queensland, 

 which I regard with some hesitation as this species, of which 

 the male only was previously known. They are somewhat 

 larger (long. 6 1.) than I should expect the female of lejndiis 

 to be and are considerably less nitid than the male, with 

 the dorsal puncturation a trifle stronger and the hind angles 

 of the prothorax slightly less obtuse, so that from a certain 

 point of view (looked at obliquely across the insect) they appear 

 more sharply subdentiform than those angles appear in lepi- 

 dus (male) from a similar point of view. Moreover the hind 

 tarsi are evidently stouter (which is not likely, I think, to be 

 a female sexual character). It is quite possible, therefore, 

 that they represent a distinct closely allied species. 



0. lugiihris, Blackb. At the time when I described this 

 species I regarded my specimens as females, but I have now 

 no doubt that one of them is a male. Its sexual characters, 

 however, are very slight, consisting in considerably greater 

 stoutness of the front tarsi, less convexity of the ventral seg- 

 ments, and a difference in the pygidium — which is perpendi- 

 cular in the female but inclined inward in the male so that 



* For notes on labrum vide infra 0. porosus, sp. nov. 



