of the Amazon Valley. 435 
1 . Oxymerus hasalis. 
Trachyderes hasalis, Dalman_, Anal. Ent. p. 65. 
Oxymerus hasalis, Dupont, Mag. Zool. 1838, p. 35, 
pi. ccviii. f. 1. 
Rufo-castanens, abdomino, elytris (basi excepta), et 
pedibus posticis, nigris ; thorace immacnlato ; antennis 
medio fulvis, apice infuscatis. 
Long. 7 lin. ^ $ . 
Hah. — Santarem. 
Tbe Amazons specimens differ from the Brazilian typical 
form in the basal red of the elytra being much larger, 
extending beyond the scutellum, 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 lineatus, Dupont, Mag. Zool, 1838, p. 41, 
pi. ccxi. f. 1. 
Oxymerus rivulosus, Dup. lih. cit., p. 42, pi. ccxi. f. 2. 
Castaneo-fulvus, interdum pallidior, thorace punctis 
11 nigris, elytris lineis quatuor et margine pallidis, lineis 
Ima prope scutellum et 3ia abbreviatis ; antennis pedi- 
busque immaculatis ; abdomine interdum basi infuscato. 
Long. 5-9 lin. S ? • 
Hah. — Para. Sometimes abundant in new clearings. 
According to DuponPs own description, there is no 
real difference between his 0. lineatus and 0. rivulosus. 
The size is of no importance in a group where it varies 
very greatly in almost every species. 
Sub-fam. Metopoccelin^. 
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 
