of the Amas^on Vulley. 2l)o 



plagiatira argenteo-tomentoso ; elytris utrinque ante 

 medium macula discoidali et longe post medium fascia 

 transversa marginem lateralem haud attingente fulvis, 

 sparsim punctatis ; femoribus paulo incrassatis, posticis 

 elytris S paulo longioribus, ? multo brevioribus, apice 

 breviter bispinosis vel dentatis. 



Long, 5-6| lin. c^ ? . 



Distinguished by the numerous sharp transverse ridges 

 across the disc and hinder part of the thorax. The basal 

 joint of the antennae is remarkably short, and arcuate- 

 clavate in form. In some specimens the femoral spines 

 are very short, and do not project beyond the articula- 

 tion of the tibiae ; the femora also approach the clavate 

 form ; the species stands, therefore, on the confines of 

 the two groups Octoplon and Ibidion proper. 



Hah. — Para; also Cayenne, whence I have a specimen 

 collected by M. Bar. 



6. Octoplon calUspihmi, n. sp. 



Elongatum, piceo-nigrum, nitidum, sparsim pilosum ; 

 thoracevaldeinaequali, quadri-tuberculato, et dorso spatio 

 elevato, plagiatim argenteo-sericeo, impunctato, nitido ; 

 elytris basin versus plaga laterali magna intus rotundata 

 et fascia lata pone medium antice ad suturam valde an- 

 gulata testaceo-fiavis, sparsim punctatis, apice longe uni- 

 spinosis ; femoribus paulo incrassatis, distincte bispinosis ; 

 antennis nigris, apicem versus sensim rufescentibus. 



Long. 7i lin. ? . 



The thorax is of similar elongate-cylindrical shape to 

 the allied species, but is rendered unequal both on the 

 sides and surface, by the sharp tubercles ; the centre of 

 the disc has an elongate flattish elevation, the two anterior 

 tubercles of the disc are very acute ; the pale markings 

 of the elytra are very large, and leave between them a 

 black cross-like mark, or rather, the space between the 

 anterior lateral spot and the posterior broad fascia, forms 

 a distinct oblique belt of the ground-colour of the elytra, 

 open to the equally black base by the concolorous suture ; 

 the apex is black. The thighs are not at all clavate, and 

 are distinctly bispinose, so that the species cannot come 

 within the definition of Ihidion. 



Hah. — Par<4. 



TRANS. ENT. SOC. 1870. PAUT III. (AUGUST.) Y 



