10 
a triangle ; but tbe posterior one is sometimes wanting, and in 
some of the smaller species the whole are obsolete. The elytra 
are narrowed from the shoulders to the apex. The muzzle is 
very short, being prolonged very little beyond the lower margin 
of the eyes ; but it is very broad, and the lower angles are pro- 
minent. The antennae are much longer than the body in both 
sexes, fringed with hairs beneath ; the third joint much the 
longest, the first being about two-thirds its length, and dilated 
(chiefly on its inner side), from near the base, into an elongate 
club. All the femora are strongly clavate; the fore tibiae of the 
d ) in those species which approach nearest the genus Acrocinus, 
are bent near the tip, the tubercle being very prominent, and 
the first joint of the tarsi much elongated. All the tarsi are 
remarkably narrow and elongated, especially the claw-joint, more 
so in some species than in others, a character which distinguishes 
Oreodera from Acanthoderes and the allied genera. The 6 fore 
tarsi are elongated and fringed with hairs. The sterna are 
very broad, the anterior acetabula circular, but the sutures are 
slightly gaping along their whole length. The ligula (in O. 
glauca) is membranous, narrow, deeply and narrowly cleft, and 
its outer margins are regularly rounded. The lobes of the 
maxillae are small and narrow ; the mentum extremely short and 
broad. 
The species of this genus are numerous in South America. 
Their habits are similar to those of Acrocinus, with the excep- 
tion that they are generally found adhering very closely to the 
twigs or bark of the dead trees on which they are found ; and 
their colours being assimilated to those of the wood or bark, they 
are with difficulty detected. The smaller species are exclusively 
confined to the slender branches, the length and slenderness of 
their tarsal joints and claws being specially adapted for clinging 
to them. The females deposit their eggs on the bark ; and the 
larvae, when hatched, penetrate into the wood. 
§ Disk of thorax with three or two prominent tubercles : tips of the 
elytra truncated. 
1. Oreodera undulata, n. sp. 
O. elongata, depressa, tomento tenuissimo holosericeo griseo-olivaceo 
vestita : elytrorum apicibus oblique sinuato-truncatis, dimidio 
basali granulato-punctato, apicali lineis undulatis griseis et fuscis 
ornato. Long. 7 lin. S • 
Head sooty-brown, opake ; eyes nearly touching the central 
furrow on the vertex. Antennae sooty-brown, the base of each 
joint from the third light grey. Thorax with large lateral 
tubercles and three discoidal ones — two transverse before, and 
