of the Amazon Valley. 457 
in Xylotribus, and the eleventh joint in the 9 is slender and claw- 
shaped. The basal joint is thickened from the base; the second, 
third and fourth are each produced at their tips into a very sharp 
and rather long spine. The body is oblong and depressed ; the 
thorax cylindrical and unarmed. The species are adorned with 
brilliantly metallic colours. The terminal joints of the palpi are 
gradually and sharply pointed. 
Hoplistocerus gloriosus, n. sp. 
H, castaneo-rufus, glaberrimus, antennis pedibusque violaceo-cupreis: 
elytris alutaceis, confertim punctulatis, rubro-cupreis, vitta angusta 
_ suturali apicem haud attingente, altera lata marginali viridi-cyancis. 
Long. 5 lin. 9? 
Head and front tumid, very finely rugose-punctate ; occiput 
and thorax marked with fine transverse striz. The cheeks have 
a spot of brilliant green ; the rest of the head and thorax is of a 
dark-chestnut hue. The elytra are oblong, broadly rounded be- 
hind, even on their surface, and uniformly punctured ; their colour 
is red or orange-copper, with the exception of a narrow sutural 
stripe not extending to the apex, and a broader marginal one, 
which are of a greenish-blue lustre. The antenne and legs are 
of a brilliant violet copper’hue; the underside of the body is 
chestnut-red, and, with the legs and the other portions of the 
body, glabrous. 
I took one individual only of this extraordinary and beautiful 
Longicorn, flying over a mass of dried twigs in an open place 
in the forest at Ega. It has a near resemblance to the Hoplis- 
tocerus refulgens of Blanchard (Voy. de D’Orbigny, Ins. p. 210, 
pl. 22. f.9); but that species is described as having the body, 
with head and thorax, of a green colour. D’Orbigny’s species 
was taken in the province of Santa Cruz de la Sierra (Bolivia), 
which region is connected with the Ega district by an uninter- 
rupted stretch of low wooded country over 14° of latitude. I 
have seen several undescribed and distinct species of this genus 
in the collections of Count Mniszech at Paris and Messrs. Bowring 
and Pascoe in London. 
Genus CycLtoprerius, Thomson. 
Thomson, Classif. des Cérambyc. p. 32. 
In this genus, which is still more extraordinary in form than 
the preceding, the second and third antennal joints have an 
elongated and very slender spine at their tips; but the fourth, 
instead of being armed with a spine, is dilated on one side of 
the apex into a large, thick, rounded knob, clothed with a vel- 
vety pile. The antenne differ also from those of the preceding 
two genera in being greatly elongated and slender, in the g 
