148 Mr. H. W. Bates on the Longicorn Coleoptera 
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 Leiopodine ; but the 
eyes are rather smaller and more pointed beneath than in many 
of the foregoing genera; they resemble, however, very closely 
the same organs in the restricted genus Lezopus. 
1. Cosmotoma rubella, u. sp. 
C. rufescens: thoracis lateribus obscurioribus: elytris tomento 
argenteo strigosis, postice nigro fasciatis. Long. 23-35 lin. (6 
exempl.) 
Head dull red. Antenne 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 bemmg dusky. Body 
beneath dusky, with patches of grey pile. Legs reddish testa- 
ceous. 
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 Chévrolat (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 nigricollis, n. sp. 
C. rufescens: thorace nigro velutino: elytris tomento argenteo 
strigosis, postice nigro fasciatis. Long. 3$-4 lin. (5 exempl.) 
Head dull black. Antenne red, the hairy clothing black. 
Thorax deep velvety black. LElytra 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 
as common an insect at Ega as its sister form is at Para. It is 
possible that it may be the species described by Thomson as 
Beltista adjuncta; but the following phrase in this author’s 
diagnosis, “prothorax et elytra extremitate nigra, illo versus 
apicem maculis 2 albis nebulosis,” is quite unsuited to our C. 
nigricollis, there being no white spots near the apex of the tho- 
vax. The locality of Beltista adjuncta is given as San Domingo; 
