66 
Amniscus pictipes, 
A. oblongus, testaceo-rufus, nigro canoque variegatus : thoracis 
dorso trituberculato, tuberculis anticis fortiter elevatis : elytris 
prope basin bifasciculatis. Long. 3| lin. <S 5 . 
Head yellowish^ spotted with black. Antennae reddish, joints 
tipped with black ; basal joint swollen beneath near the apex, 
the latter toothed. Thorax with three tubercles in a triangle on 
the disk, the two anterior very prominent ; lateral tubercles ob- 
tuse; the colour is brown testaceous, with two black dorsal 
stripes. Elytra oblong, gradually narrowed from the middle to 
the tip, which latter is not truncated; the surface is thickly 
punctured, especially towards the base, and in the place of the 
centre- basal ridge there is a large pencil of black hairs ; the rest 
of the surface even ; the colour is testaceous brown, with the 
base and a few scattered marks blackish, an indistinct whitish 
line obliquely crossing the disk. Body beneath testaceous, 
clothed with pile of the same colour. Legs and tarsi reddish, 
spotted with grey and black. 
One example, taken at S. Paulo, Upper Amazons. The spe- 
cies also inhabits South-eastern Brazil, specimens from Bio 
Janeiro (taken by Mr. Squires) not differing from the Amazonian 
example except in being rather duller in colour. 
Genus Alcidion (Dej. Cat.), Thomson. 
Thomson, Classif. des Cerambyc. p. 12. 
Char, emend. Thorax free from tubercles on the disk, or at 
most but slightly uneven, its sides unarmed. Elytra broad and 
convex at the base, thence narrowing in a nearly straight line 
to the apex, with the surface sloping equally in that direction ; 
the apex truncated and toothed or spined, and the centrobasal 
ridges more or less prominent. Apical segments of the abdomen 
and ovipositor not produced in the female. Thighs abruptly 
clavate ; basal joint of the tarsi generally longer than the two 
following united. 
As above defined, the genus Alcidion will comprise a con- 
siderable number of species distinguished from Amniscus by the 
peculiar shape of the elytra, and from other allied genera by the 
thorax wanting the lateral spines. It is divisible into two groups, 
— one of which is distinguished by the species having a raised 
line along the whole length of the elytra on each side, from the 
centro-basal ridge to the external apical angle ; and the other by 
the absence of these lines, the centrobasal ridges at the same 
time being very prominent. The Amazonian species belong 
wholly to the second group*. 
* A. latum (Thomson, 1. c.), of Mexico, seems to belong. to the first group; 
