228 
Mr. G. R,. Waterhouse’s Descriptions 
thorax, mesosternum, legs, and antennse, (if we except the length) ; 
and in the form of the head it however agrees most nearly with 
that group of which Cerambyx moschatus may be regarded as the 
type, — the genus Callichroma of Latreille.* 
The general form of the head is that of Callichroma ; the basal 
joint of the antenna is stout, as in that genus, and the remaining 
joints differ only in being a trifle shorter ; they bear the same re- 
lative proportions one to another ; the two terminal joints unfor- 
tunately are lost, but if present, the antennae would no doubt, 
when bent backwards, extend nearly to the apex of the elytra ; 
the thorax is broader than long, and nearly equal in width to the 
elytra ; the upper surface is slightly uneven, and has scattered 
punctures, but no distinct tubercles. In the prothorax there is 
a great resemblance between this insect and the species of Calli- 
chroma, excepting that it is proportionately broader and shorter, 
and has the lateral projecting tubercle somewhat obtuse, instead 
of acute, as in that genus ; the prosternum is also of the same 
structure. The mesosternum differs in having an obtusely pointed 
tubercle situated between the middle pair of legs. The elytra are 
broader than in Callichroma, more obtusely terminated, and also 
differ in having a glossy brilliant surface, instead of the somewhat 
dull and silk-like texture, so general in that group. The legs are 
less compressed, and rather shorter, and the hinder tibiae are not 
curved. The tarsi resemble those of the genus with which I am 
comparing it. 
The presence of a tubercle on the mesosternum, the shortness 
of the antennae, greater width of the body, and straight hinder 
tibiae, combined with other distinctive characters pointed out, 
renders it necessary to separate this insect from Callichroma. I 
propose therefore to characterize it under the name Callona f 
tricolor. 
Callona tricolor. 
C. splendide viridis ; capite, thorace, antennis, tibiis tarsisque 
nigris ; thorace maculis duabus lunulatis ad latera insignito, 
his, nee non fernoribus, corporeque subtus sanguineis ; seg- 
ments abdominis postice nigris. 
Long. corp. 13g lin. ; lat. 4J lin. 
Hab. Caraccas ? 
* The palpi, which would furnish some guide in determining the affinities of 
this insect, are unfortunately broken off. 
t From x.a.\\ovn, beauty. 
