214 MALACODERMATA. 
prothorax behind is of no use (as Mr Horn has himself observed) for the separation of 
these genera ; and I am inclined to reserve a detailed examination of the question for a 
revision of the whole family. 
1. Bostrychus verrucosus. (Tab. X. fig. 22.) 
Niger, opacus, prothorace antice uncinato-bicorni, disco granulato, medio subsulcato, angulis posticis subrectis ; 
elytris seriebus duabus tuberculorum, ad apicem valde callosis, apicibus singulis excisis, externe mucro- 
natis. Long. 8-12 millim. 
Hab. Guatemaa, Capetillo, El Tumbador, Cerro Zunil (Champion). 
The figure is taken from a Cerro Zunil example. . 
Smoky black, with a greyish tint like burnt cork, wider behind than in front. Head 
with the labrum distinct, transverse; maxillary palpi with the apical joint acuminate ; 
summit of the head evenly granulate. Thorax narrower than the elytra, with distinct 
hind angles, and the sides and disk roughened with tubercles, which become tooth-like 
curved points in front, two of which project over the head. ‘The elytra are very much 
roughened with tubercles, which posteriorly end in callosities. ‘There are two or three 
series of these tubercles: the larger ones are elongate; and between them are flat- 
bottomed punctures. 
The underside is a little shining, but is finely punctured. 
SINOXYLON. 
Sinozylon, Duftschmidt, Fn. Aust. iii, p- 86 (1825). 
A very widely distributed genus, of which Bostrichus bispinosus, Oliv.,=Sinoxylon 
muricatum, Dufts., &c., is the type. The species of this genus have ten-jointed antenne ; 
the club has the first two joints strongly produced internally, and they are of the serrate 
form, the five preceding are very short, together not being much longer than the first 
club-joint ; many species from Asia and the Hast generally have the elytra flatly and. 
obliquely truncate, sometimes with two mucros from the centre of this declivity. The 
species referred to this genus by North-American authors do not pertain to it, but to 
Aylopertha or Enneadesmus, or to new genera parallel to them. We have, however, 
one species from Guatemala, due to the systematic collecting of Mr. Champion. 
1. Sinoxylon championi. 
Oblongum, cylindricum, antennis tarsisque rufo-testaceis; prothorace antice muricato, granuloso, medio 
transversim eleyato, basi crebre granuloso-punctata; elytris nitidis, confuse crebrius punctulatis, apice 
oblique declivo, haud calloso. Long. 5 millim. 
Hab. GuaTEMALA, Chacoj (Champion). 
This is rather a ‘robust species, with the thorax equal in breadth to the elytra, and of 
