290 Mr. H. W. Bates on Cerarnhycidoe 
11. Gnomidolon duhiurrij n. sp. 
G. simpUci valde affine^ differ! statura majore, Hnea 
fusca elytrorum postice apud discum terminante ; tibiis 
intermediis tarsisque nigris; elytris obscurioribus. 
Long. 5 lin. (^ . 
Hah. — Tapajos. 
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 monticuloso, antice nigerrimo, laevi, 
postice argenteo sericeo; elytris flavescentibus, fascia 
subapicali ferruginea, apice albis, mucronatis, lineola 
[obliqua] media nigra et arcu nigro basali.'’^ (White.) 
Long. 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 without 
punctures, except the widely placed ones bearing long 
setae, and which run in lines 3 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 3 the legs are pale testaceous- 
red, the tips of the hindmost thighs dusky. 
Hah. — River Tapajos. 
