of the Amazon Valley. 447 
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 7. 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) bispecularis, White. 
sid ee bispecularis, White, Cat. Long. Col. in Brit. Mus. ii. p. 403, 
pl. I. de 
Found occasionally on foliage in the forest at ga. 
Genus CHALASTINUS, nov. gen. 
Head narrow ; antenniferous tubercles prominent. Antenne 
slender, elongated, 11-jointed in both sexes, the terminal joint 
shorter than the preceding, filiform; the third and five follow- 
ing joints thickened at the tips and curved, especially in the @. 
Thorax much narrowed anteriorly, scarcely perceptibly tubercu- 
lated on the sides. Elytra subtrigonal, depressed, rounded to- 
gether at the tips. Mesosternum bituberculated, hind margin 
sinking behind into a fovea in common with the fore edge of the 
metasternum. The fore tarsi of the ¢ not dilated, but fringed 
with fine hairs. 
This genus has a great resemblance in general figure to Thry- 
allis (Thomson, Class. p. 31); but the antenne in Thryallis have 
only ten joints, and the sterna are broad and plane, the pro- 
sternum especially being remarkably broad. The Anisocerinze 
vary to such a degree in these and other parts of structure, that 
almost every species might be made into a separate genus, if we 
attached the same importance to those characters in this as in 
other groups of Coleoptera. 
Ch. Egaensis, White. 
Anisocerus Egaensis, White, Cat. Long. Col. in Brit. Mus. ii. p. 408. 
The typical form of this species seems to be confined to the 
neighbourhood of Ega, on the Upper Amazons. It has on each 
elytron behind the middle a short, oblique, ochreous belt, com- 
mencing on the sides near the middle, and not reaching the 
suture, near which, in a line with the belt, is a round ochreous 
spot. This is common at Ega on decaying branches of trees in 
