of the Amazon Valley. 435 



1. Oxymerus basalts . 

 Trachyderes hasalis, Dalman, Anal. Ent. p. 65. 



Oxymerus hasalis, Dupont, Mag. Zool. 1838^ p. 35, 

 pi. ccviii. f. 1. 



Rufo-castaneus, abdomine, elytris (basi excepta), et 

 pedibus posticis, nigris ; thorace immaculato ; antennis 

 medio fulvis, apice infuscatis. 



Long. 7 lin. ^ ? . 



Hob. — Santarem. 



The Amazons specimens diflfer from the Brazilian typical 

 form in the basal red of the elytra being much larger, 

 extending beyond the scutellura, and in the fore and 

 middle femora^ and the basal half of the hind femora, 

 being red. 



2. Oxymerus rivulosus. 



Trachyderes rivulosus, Germar, Ins. Sp. Nov. p. 512, 



Oxymerus Uneatus, Dupont, Mag. Zool. 1838, p. 41, 

 pi. ccxi. f. 1. 



Oxymerus rivulosus, Dup. lib. cit., p. 42, pi. ccxi. f. 2. 



Castaneo-fulvus, interdum pallidior, thorace punctis 

 11 nigris, elytris lineis quatuor et margine pallidis, lineis 

 Iraa prope scutellum et 3ia abbreviatis ; antennis pedi- 

 busque immaculatis ; abdomine interdum basi infuscato. 



Long. 5-9 lin. S ? • 



JEab. — Para. Sometimes abundant in new clearings. 



According to Dupont's own description, there is no 

 real difference between his 0. Uneatus and 0. rivulosus. 

 The size is of no importance in a group where it varies 

 very greatly in almost every species. 



Sub-fam. Metopoc(elin^. 



Genus Metopoccelus. 



Serville, Ann. Soc. Ent. Fr. 1832, p. 170; Lacord. Gen. 

 viii. 244. 



The position of this genus is one of the few points in 

 which I venture to depart from the arrangement of 



