293 
of the Amazon Valley. 
plagiatim argenteo-tomentoso ; elytris utrinque ante 
medium macula discoidali et longe post medium fascia 
transversa marginem lateralem haud attingente fulvis, 
sparsim punctatis ; femoribus paulo incrassatisj posticis 
elytris J paulo longioribus, ? multo brevioribus^ apice 
breviter bispinosis vel dentatis. 
Long, 5-64 S ? • 
Distinguisbed by the numerous sharp transverse ridges 
across the disc and hinder part of the thorax. The basal 
joint of the antennas 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 tibias ; the femora also approach the clavate 
form ; the species stands, therefore, on the confines of 
the two groups Octoplon and Ihidion proper. 
Hah. — Para; also Cayenne, whence I have a specimen 
collected by M. Bar. 
6. Octoplon callispilum, n. sp. 
Elongatum, piceo-nigrum, nitidum, sparsim pilosum ; 
thorace valdeinaequali, 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-flavis, sparsim punctatis, apice longe uni- 
spinosis ; femoribus paulo incrassatis, distincte bispinosis ; 
an tennis nigris, apicem versus sensim rufescentibus. 
Long. 74 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. — Para. 
TRANS. ENT. SOC. 1870. PART III. (AUGUST.) 
Y 
