AUSTRALIAN SCARITIDA, 83 
The species now figured exhibit several peculiarities of import- 
ance as contrasted with the other Scaritideous insects. The singular 
and occasionally brilliant metallic tints of some of the species have 
hitherto been almost unknown in this section; the dilated form and 
large size of the three species represented at the bottom of plate 
22, and the singular characters of the three insects figured in plate 
23, fig. 2, 3, and 4, are also especially worthy of notice. 
I now proceed to the description of the Australian species of this 
section. 
CARENUM, Bonelli. 
(Syn.—Arnidius, Leach, Bdv. Eutoma, Newm.) 
This genus was founded by Bonelli (Observ. Entomol. 2nd part, 
p- 47, and Turin Trans. 1813, p. 479), upon a species which he 
examined in the collection of the Jardin des Plantes, at Paris, and 
which he considered as identical with the Searites cyaneus of Fabri- 
cius, from which, however, it is quite distinct. The chief character 
of the genus, as detailed by Bonelli, consists in the enlarged and 
triangular form of the terminal joint of the labial palpi, whilst the 
maxillary palpiare nearly cylindrical. The antenne are short, with 
the first joint apparently* not longer than the second [ which is about 
as long as the third]; the anterior tibie are externally dentated ; 
the elytra oblong or oval, soldered together without wings beneath 
them ; the mandibles are also strongly toothed on the inside, the 
mentum toothed in the centre of its deep emargination. The 
labrum is transverse but differs in form in different species, being 
sometimes horizontal, as in Searites, but sometimes deflexed in front, 
as in pl. 22, fig. 3 a. The antenne are variable in length, as well 
as in the relative thickness of the terminal joints ; the fore feet also 
differ in the number of the digitations, and there is also consider- 
able difference in the form and sculpture of the elytra. As however 
all these insects agree in their more essential characters, I have 
reduced the genera Arnidius and Eutoma to synonymes, because 
almost every species presents characters of variation as important 
as those possessed by the types of the two last-mentioned groups. 
Srecies L—Carenum Bonellii, W. Nigrum, pronoto ct elytris viridi late marginatis, horum 
carina marginali violacea ; disco levi, punctis duobus versus basin alterisque duobus sub- 
apicalibus, pronoto in medio fossula longitudinali et transverse striato, basi utrinque 
obliqué impresso ; tibiis anticis externé bidentatis. Long. corp. (sec. fig. Brullei) lin. 10, 
lat. Jin. 3. Mus. Jard. des Plantes. 
* I say apparently, because in most of the species the anterior lateral angles of the head ure 
produced over the base of the basal joint of the antenn, causing it to appear shorter than it 
really is. 
G 2 
