290 Mr. H. W. Bates on CeramhyciJce 



11. Gnomidolon duhium, n. sp. 



G. simpKci valde affine, differt statura raajore, linea 

 fusca elytrorum postice apud discum terminante ; tibiis 

 intermediis tarsisque nigris; elytris obscurioribus. 



Long. 5 lin. S > 



Hah. — Tapaj os . 



Genus Octoplon. 

 Thomson, Syst. Ceramb. p. 218. 



Hinder thighs slightly and gradually thickened, neither 

 linear nor clavate, both the intermediate and posterior 

 with two short equal or subequal spines at the tip. 

 Thorax tuberculate, clothed with silvery tomentum. 



I think this genus may be better limited to the second 

 section, as characterized by Lacordaire, Gen. viii. 331, 

 note. 



1. Octoplon Orpa. 

 Ibidion Orpa, White, Cat. Longic. Brit. Mus. p. 227. 



'* Thoracis dorso raonticuloso, antice nigerrimo, Itevi, 

 postice argenteo sericeo ; elytris flavescentibus, fascia 

 subapicali ferruginea, apice albis, mucronatis, lineola 

 [obliqua] media nigra et arcu nigro basali." (White.) 



Long. 54 lin. 



In the male, the third antennal joint is gradually 

 thickened, and the fourth very much shorter than either 

 the third or fifth. The thorax has five distinct large 

 flattish tubercles. The elytra are polished, and \^•ithout 

 punctures, except the widely placed ones bearing long 

 seta3, and which run in lines ; the basal two-thirds are 

 fulvous, then follows a broad reddish belt, and the apical 

 part is testaceous yellowish-white; the basal fulvous por- . 

 tion is marked with a blackish curved line enclosing 

 laterally a paler spot, behind this there is an oblique 

 dark line, between which and the reddish belt is a paler 

 fascia. The femora are elongate, the hind ones rather 

 longer than the elytra, and armed with two short, dis- 

 tinct, nearly equal spines ; the legs are pale testaceous- 

 red, the tips of the hindmost thighs dusky. 



Ilah. — River Tapajos. 



