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



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

 the 8th ; antennce brown, base, palpi, base of anterior tibiae 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 Argutor* ; 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 profundi striatis, 



costa obscur^ viridi. 

 Length 7 ; breadth 2| lines. 



Shining black ; antennce fuscous, except at the base : head 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. Elytra nearly thrice as long as the thorax, with 

 deep striae, 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 multilim an- 



gustatis ; elytris profundi striatis. 

 Length 6, breadth 2^ lines. 



Shining black: antennce fuscous, except at the base: head with two impres- 

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

 where there are 2 foveae, 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. Ent. vol. xiv. pi. 666. f. 4. 

 2 c 2 



