49 
Thorax fulvous, the disk clouded with dusky ; the lateral spines 
straight, the dorsal tubercles acute. Elytra broad at the base, 
then gradually narrowed to three-fourths their length, whence 
they are more abruptly narrowed and rounded to the apex, which 
is truncated; the sutural angles simply pointed, the external 
ones produced into spines ; the tubercles and punctures on the 
surface are arranged precisely as in P. Jansoni, but the colour is 
different; the base is of a tawny-brown hue, the central parts 
and the apical third sooty brown, the interval between these 
darker patches being of a paler tawny colour. Legs black, a 
ring at the apex of the femora and the tarsi bright fulvous. 
This species, which is no doubt a local modification of P. Jan- 
soniy is found at Para. 
Group Anisocerin(2. 
Genus Trigonopeplus, Thoms. 
Thomson, Class, des Ceramb. p. 339. 
This genus is an aberrant form in the group Anisocerinse, differ- 
ing from most of the other genera in having the terminal joint of 
the antennae, compared with the penultimate, of normal length, 
and the elytra obtusely truncated at the tip, instead of rounded. 
It resembles the genus Chalastinus so much in general form that I 
have thought it better to place it in this group. The third and three 
following joints of the antennae are slender and slightly thickened 
at the tips ; this indicates an affinity with the Anisocerinae, where 
the thickening of the tips of the antennal joints is a very general 
character. The typical species of Trigonopeplus [T. signatipennis, 
Thoms., a native of South-east Brazil) has a deep semioval 
notch in the middle of the epistome — a singular peculiarity of 
structure, of which it is difficult to guess the purpose, especially 
as the labrum beneath it remains entire. The species of this 
genus which I found in the Amazon region has the epistome of 
the usual shape, the muzzle, in fact, being of exactly the same 
form as in the next genus, Chalastinus. It differs also from the 
type of the genus in the shape of the head, the antenniferous 
tubercles not being at all salient, whilst they are strongly raised 
in T. signatipennis. It agrees, however, so closely with the typi- 
cal species in all other characters that I think it cannot be sepa- 
rated from it generically. It will be convenient, nevertheless, 
to treat it as a group or subgenus, which may be named 
Anepsius. 
Trigonopeplus [Anepsius) bispecularisy White. 
Trigonopeplus hispecularis, White, Cat. Long. Col. in Brit. Mus. ii. p, 403, 
pi. 10. f. 1. 
Found occasionally on foliage in the forest at Ega. 
G 
