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of Longicorns, in groups which have otherwise no resemblance — 
the fourth joint in Cosmotoma having a thick brush of hairs 
attached to its upper surface, and the second and third having 
thin pencils of hairs at their tips, besides being clothed with a 
few long hairs, like the remaining joints. The thorax has a thick 
conical .protuberance behind the middle, in the place of the 
lateral spines, and its surface has two large obtuse tubercles. 
The elytra are clothed with long hairs instead of setse, and the 
centro-basal ridges, which are very thick and large, are also 
crested with hairs, the rest of the surface being free from in- 
equalities. The terminal abdominal segment is of normal size 
and obtuse in both sexes, the female not having an exserted 
ovipositor. The sterna, head, and muzzle are of the same shape 
and structure as in the majority of the Leiopodinse j but the 
eyes are rather smaller and more pointed beneath than in many 
of the foregoing genera j they resemble, however, very closely 
the same organs in the restricted genus Leiopus, 
1. Cosmotoma ruhellay n. sp. 
C. rufescens : thoracis lateribus obscurioribus : elytris tomento 
argenteo strigosis, postice nigro fasciatis. Long. 2^-3^ lin. (6 
exempt. ) 
Head dull red. Antennae red, the hairy clothing black. 
Thorax dull red, the sides behind tinged with dusky, and the 
under surface black. Elytra dull red, streaked with silvery 
tomentum ; behind the middle is a broad black fascia, followed 
by a narrow silvery belt, the apex itself being dusky. Body be- 
neath dusky, with patches of grey pile. Legs reddish testaceous. 
A common insect on broken branches in the forest at Para 
and on the banks of the Tapajos. I have received Cayenne 
specimens from Paris as Cosmotoma venustulum of Dejean^s Cata- 
logue; but, according to Chevrolat (Journal of Entomology, 
vol. i. p. 188), the C, venustulum of Dejean^s Catalogue is the 
species described by M. Thomson as Beltista adjuncta, which, 
from the description given, cannot be the same as our C. rubella. 
2. Cosmotoma nigricollisj n. sp. 
C. rufescens : thorace nigro velutino : elytris tomento argenteo 
strigosis, postice nigro fasciatis. Long. 3f-4 lin. (5 exempl.) 
Head dull black. Antennae red, the hairy clothing black. 
Thorax deep velvety black. Elytra dull red, streaked with 
silvery tomentum ; behind the middle is a broad black fascia, 
followed by a narrow silvery belt, the apex itself being dusky. 
Body beneath dusky, with patches of grey pile. Legs reddish 
testaceous. 
This form represents C. rubella on the Upper Amazons, being 
