209 
both angles -of the tnmcature being acute, but the external one 
greatly prolonged. In others the external angle is still further 
prolonged, and the sutural one only just perceptible. This 
feature is carried out to greater lengths in other species, in 
which the truncature is so extremely oblique as to be imper- 
ceptible, the elytra then appearing to be terminated each in a 
long, fine point. 
The species of Hippopsis, like all other Oncideritse, are para- 
sitic on the slender branches of trees. They choose, however, 
the most slender twigs, and cling to them so closely by their 
short stout legs and elongated claws as to be difficult of detec- 
tion. All that I have seen possess the same style of coloration 
— a ground-colour black or brown, clothed with extremely fine 
grey pile, and marked with tawny or dingy grey stripes extend- 
ing over head, thorax, and elytra, the diversities of which some- 
times form good specific characters. 
1. Hippopsis truncatella, n. sp. 
H. linearis, fusca, capite, thorace et elytris utrinque vittis tribus 
testaceo-griseis ; capite thorace latiore, pone oculos sensim angus- 
tato ; elytris paulo ante apices attenuatis, apice utrinque oblique 
sinuato-truncatis, angulo interiore prominulo acuto, exteriore late 
producto, vittis griseis duabus interioribus ante apicem conjunctis. 
Long. lin. 
Head broader than the thorax, curvilinearly narrowed behind 
the eyes ; face strongly retracted ; eyes prominent ; brown, face 
clothed with thick greyish pile; vertex coarsely punctured, and, 
with the sides, marked with six greyish vittse, the two central 
ones of which gradually converge on the crown, and the four 
others traverse the deflexed sides of the neck and cheeks. 
Antennae slender, basal joint gradually thickened from base to 
apex; colour rusty brown. Thorax narrower than the head or 
elytra, cylindrical, coarsely punctured, brown, marked on each 
side with three greyish vittae, the lowermost of which is con- 
tinuous along the sides of the breast. Elytra scarcely percep- 
tibly narrow'ed from the shoulders to near the apex, thence 
rapidly narrowed ; the apex truncated a little obliquely, the 
truncature incurved near the sutural angle, w^hich is produced 
and acute, the outer angle being broad and also acute, but 
moderately produced ; surface thickly punctured, partly in lines, 
brown, and marked on each elytron with three broad, greyish 
vittse, the two inner ones of which unite before the apex, and 
the lateral one interrupted at the shoulder, under which is a 
small grey streak. Body beneath and legs clothed with fine 
greyish tomentum. 
Para and Lower Amazons. 
X 
