189 
nute tuberculata, parte apicali lineis tenuissimis furcatis nigris, 
medio guttis sparsis nigris ; thorace linea transversa nigra : foe- 
minse capite lato fulvescente ; maris capite angusto, fusco, inerrni. 
Long. 8-1 1 lin. (S $ . 
This species is distinguished by the basal portion of the elytra 
being thickly covered with small glossy-black tubercles, of which 
one at the hinder part of the humeral prominence is much 
larger than the rest. The tuberculated area ceases abruptly 
behind, and the disk of the elytra has only a very few scattered 
and slightly elevated black specks, which towards the apex sub- 
side into simple spots, not raised at all from the smooth surface. 
The general colour is pale ashy grey (white beneath); the apical 
part of the elytra has a few fine black lines in the form of a 
double or treble fork joined at the base. The male differs 
greatly in width of head from the female, but the antennae 
scarcely differ in proportionate length or stoutness; they are, 
however, more nearly approximated at their bases by one-half 
in the male than in the female, which gives to a male insect an 
appearance quite foreign to the genus. The male specimen be- 
fore me has a finely reticulated black patch across each elytron 
at the tips of the forked lines, of which there is only a trace in 
one of the female examples. 
Para, and at Santarem on the Tapajos. 
5. Oncideres crassicornis, n. sp. 
O. subcylindricus, postice utroque sexu attenuatus, fulvo-brunneus ; 
elytris basi tuberculis diversis sparsis instructis, postice punctis 
impressis rufescenti-brumieis in lineis furcatis ordinatis ; maris 
an tennis basi valde incrassatis, capite bicornuto. Long. 9-10 
lin. (S $ . 
Head not much wider in the female than in the male, brownish 
tawny, with the usual black stripe below each eye ; antenniferous 
tubercles in the male dentiform on each side. Antennse dark 
brown, simple in the female, one-half longer than the body in 
the male, with the basal and third joints much thickened, espe- 
cially the latter. Thorax impressed transversely, and furnished 
on each side with a tubercle ; colour brownish tawny. Elytra 
narrowed to the tip in both sexes, tawny brown, inclining to- 
wards ashy near the middle ; the basal part raised in the middle, 
and studded with a moderate number of scattered tubercles, dif- 
fering greatly in size, and all glossy black; from the middle to 
the apex there is a number of shallow punctures covered each 
with a reddish-brown spot and arranged in forked lines. Body 
beneath and legs clothed with tawny-brown tomentum. 
Ega, and banks of the Tapajos. 
