202 
vertex, punctured, tawny-grey. Antennae distant at the base, 
supporting tubercles with their inner edges prominent; filiform, 
but somewhat tapering to the extremity, dark brown, bases of 
joints grey; third joint scarce perceptibly curved. Thorax of 
the same width as the head, cylindrical, scarcely longer than 
broad ; lateral tubercle inconspicuous ; surface coarsely but 
sparingly punctured, greyish brown, dorsal line and two obscure 
lateral streaks grey. Elytra linear, coarsely punctured (more 
thickly so towards the base), and with faint longitudinal eleva- 
tions on the disk, brown, sides in some examples paler ; disk 
with one or more oblique grey vittse. Body beneath and legs 
greyish brown ; abdomen variegated with brown and grey. 
Tapajos and Upper Amazons, also Cayenne. Examples from 
Cayenne and the Tapajos are much darker than those from the 
Upper Amazons. 
2. Cacostola jiexicornisj 
C, linearis, castaneo-fusca, obscura ; capite angustiore ; thorace brevi ; 
elytris creberrime punctatis ; aiitemiis tenuibus, articulo tertio 
valde curvato. Long. 3^1in. S $ • 
Head small ; forehead with a deeply impressed longitudinal 
line, punctured, coarsely pubescent ; vertex coarsely punctured; 
antenniferous tubercles with a small conical projection on their 
inner sides. Antennae rather slender, dark brown, with the 
bases of the joints pale testaceous; third joint strongly bent; 
terminal joint in the male half as long again as the preceding. 
Thorax short, lateral prominences conspicuous, surface closely 
punctured, dark rusty brown. Elytra linear, very closely and 
equally punctured from base to apex, dark rusty brown. Body 
beneath and legs dingy ashy; abdomen variegated. 
Slender dead twigs, Santarem. 
Genus Amphicn^eia, nov. gen. 
Body small, linear. Head very short, vertically ; upper por- 
tion of the eyes encircling the base of the antennae; but the 
reniform lobe of considerable width, and not attenuated as 
in the eyes of the genus Dorcasta^ ; lower lobe convex, 
prominent; forehead convex. Antenniferous tubercles very 
short, oblique, and unarmed : antennae filiform, stout, clothed 
with short hairs, the joints beneath fringed with long and 
straight hairs ; first joint moderately short, thickened nearly 
* The upper, reniform portion of the eyes in Dorcasta is very narrow, 
and, in the middle, attenuated. This is a step towards the total disappear- 
ance of the upper lobe, which is a distinguishing feature of Spalacopsis, 
Newm., a genus closely allied to Dorcasta. 
