Capt. P. P. King's South AmerucDi Coleoptera. 191 



the base, a puncture on the disc upon the second stria, and several along 

 the 8th ; anfeiuue brown, base, palpi, base of anterior tibice and tarsi cas- 

 taneous. 



A female from Monte Video. The mentum has a very depressed conical 

 lobe in the middle, which does not accord with that of Argittoi-* ; nevertheless 

 it agrees so well in other respects that I cannot think they ought to be sepa- 

 rated. 



*13. Omaseus marginalis. Curt. 



Niger, nitens ; thorace foveis duabus simplicibus ; elytris profunda striatis, 



costa obscure viridi. 

 Length 7 ; breadth 2\ lines. 



Shining black ; untciinw fuscous, except at the base : lieud with '2 impressions in 

 front : thorax quadrate-cordate, with a channel down the back, and a large 

 deep fovea near each posterior angle, which is faintly punctured and 

 almost acuminated. Elj/tru nearly thrice as long as the thorax, with 

 deep striœ, the 1st abbreviated, 2nd and 3rd united at the base; 2 punc- 

 tures on the 3rd stria below the middle, and another between the 3rd and 

 4th towards the base ; the costa dull green, with punctures at the base 

 and apex, which is rather strongly emarginate. 



The lobe of the mentum is entire. This appears to be a common species 

 in Valparaiso and Chili : my specimens I received from Mr. Miller. 



14. Omaseus Nebrioides. Curt. 



Niger, nitens ; thorace foveis duabus medio profundioribus, basi multùni an- 



gustatis ; elytris profunde striatis. 

 Length 6, breadth 2^ lines. 



Shining black: antennœ hi^coxi?,, except at the base : liead with two impres- 

 sions in front : thorax cordate-truncate, being narrowed at the base, 

 where there are 2 fovese, with a line at the bottom ; the angles are acute 

 and there is a channel down the back : elytra thrice as long as the thorax, 

 with a yellowish tinge, deeply striated, 1st abbreviated, and and 3rd 

 united at the base, 2 punctures belowthe middle on the 3rd and one towards 



* Vide Curt. Brit. Eut. vol. xiv. pi. 666. f. 4. 

 2 c 2 



