98 Colydiide of the Amazons Valley. 
vex, rounded anteriorly and posteriorly, covered with erect, scattered, 
ereyish scales; scutellum small, round; elytra scarcely broader than 
the prothorax, parallel, rounded at the apex, each with six lines of 
closely placed semierect greyish scales; body beneath reddish chestnut, 
scarcely punctured, the abdomen with a few short elevated longitudinal 
lines; legs short, reddish chestnut; tibiee short, subtrigonate; tarsi 
nearly as long as the tibize, the last joint longer than the others toge- 
ther. Length 1 line. 
Discoloma orbicularis. 
D. rotundata, convexa, picea; elytris punctulatis, punctis majoribus in- 
termixtis, humero calloso. 
Hab. Ega. 
Nearly orbicular, convex, pitchy brown, with a very fine but some- 
what sparse pubescence ; head very small; antennze about twice as 
long as the head; prothorax minutely punctured, very transverse, the 
dilated borders on each side forming two-thirds of its breadth at the 
base; scutellum triangular; elytra as broad as long, very minutely 
punctured, with larger punctures interspersed on the disk, near each 
shoulder a small callosity, the dilated margins subdiaphanous, irregu- 
larly waved at their junction with the disk anteriorly, with five or six 
raised lines on each side, between which the margin is finely plaited ; 
body beneath pale brown, finely punctured ; the legs nearly testaceous. 
Length 13 line. 
At once distinguished by its greater size, its orbicular outline, and 
its greater convexity of surface. 
Discoloma paulla. 
D. ovata, depressa, obscure testacea; elytris fere impunctatis, limbo di- 
stincto, humero calloso. 
Hab. Ega. 
Shortly ovate, depressed, dull testaceous, almost obsoletely punctured, 
and very finely pubescent; head small; eyes dark brown; prothorax 
with its dilated borders on each side at the base passing gradually into 
the disk; scutellum small, triangular; elytra longer than broad, the 
dilated margins opake, very distinct, not waved nor plaited, their 
edges with three or four raised points on each side, the shoulder with a 
small callosity ; body beneath and legs dark testaceous. Length # line. 
The narrowest of the five* species known to me, and very distinct, 
as a comparison of the descriptions will show. 
* One of these, Discoloma Fryi, is described in the first volume of this work 
(p. 115). Another I have received from M. Deyrolle, under the name of “ Thy- 
reosoma Mexicanum, Chevy.” It is a broadly ovate, subdepressed insect, with a 
dark-brown prothorax, the dilated margins of the elytra less distinctly separated 
