178 
uneven on the surface, uniform dingy brown. Elytra oblong 
trigonal; shoulders moderately prominent, and thence gradually 
narrowed to the apex, which is broadly rounded ; surface con- 
vex ; centrobasal ridges not at all prominent, and quite destitute 
of tubercles, the basal half of the elytra being simply punctured. 
Body beneath rufescent tawny, centre of abdomen black ; legs 
brown, claw-joints of tarsi with their basal halves pale reddish. 
Ega; rare. 
3. Hypselomus Amazonicus, Thomson. 
Hypsioma Amazonica, Thomson, Classif. des Ceramb. p. 119. 
H. convexus, brunneus ; elytris humeris conicis, subuiicinatis, pone 
medium fascia irregulari pallidiore, deinde ad apices pallide mar- 
moratis ; antennis articulis basi rufescentibus : maris tibiis posticis 
apice valde dilatato-compressis. Long. 9 lin. d $ . 
Closely allied to H. picticornis, but larger and darker, with 
the elytra behind the middle much more variegated with pale 
ashy brown, and the conical protuberances of the shoulders 
strongly curved anteriorly. The antennse are coloured as in H. 
picticornis, the second and basal half of the third, with bases of 
the remaining joints being pale reddish. The underside of the 
body is tawny brown, with the centre of the abdomen black. 
The elytra are smoothly and strongly convex from base to apex, 
without any trace of centrobasal ridge or tubercles. 
Ega, Upper Amazons. 
4. Hypselomus dimidiatus, n. sp. 
H. modice convexus, fuscus, fulvo irroratus ; elytris apud medium 
ochraceo fasciatis, deinde usque ad apices pallide ochraceo-brun- 
iieis fusco striatis et maculatis ; thorace supra quinquetuberculato, 
lateribus acute tuberculatis. Long. 6-7 lin. S 2 • 
Head dingy brown. Antennse dull brown, base of each joint, 
from the third, pallid-reddish. Thorax uneven, disk on each 
side with two prominent tubercles, and dorsal line elevated be- 
hind into a ridge, sides each with an acute tubercle; dingy 
brown. Elytra with very prominent shoulders, the anterior side 
of the subconical projection oblique ; centrobasal ridges slightly 
elevated, but not tuberculated ; dark brown, sprinkled with ful- 
vous ; behind the middle a pale oblique belt or broad triangular 
spot darker in the middle, thence to the apex light brown with 
darker lines and spots. Body beneath tawny brown, middle of 
abdomen black. Legs black, apex of thighs fulvous, claw-joint 
red, apex black. Posterior tibiae in the male dilated at the apex; 
supplementary antennal joint in the same sex very short or 
wanting. 
Ega. Bather variable in the colour of the posterior part of 
