20 INSECTA. 
Pacuypus, Dej.—Geotrurss, Menotontua, Fab. 
The antennz of the males are composed of but eight joints, of 
which the five last form the club. The mandibles are in the form of 
very thin, triangular, elongated leaflets, and are entirely concealed, 
as is also the labrum. The terminal lobe of the maxillz is very 
small, scarcely distinct, and without teeth. The mentum is ex- 
tremely prominent, projects forwards, and is rounded on the summit. 
The terminal joint of the palpi is the longest of all, and nearly cylin- 
drical. 
The body is thick, the epistoma semicircular, concave above, and 
distinguished posteriorly from the vertex by a transverse carina. The 
thorax of the males is excavated and armed anteriorly with a horn; 
the four posterior tibie are strong, deeply incised transversely, with 
their extremity widened and crowned with a range of little spines ; 
the spurs are large. The tarsi are long, slender, pilose, and termi- 
nated by two small equal and simple hooks. 
With the exception of the antennze and the form of the epistoma, 
this subgenus approximates much nearer to Oryctes than to Melo- 
lontha *, 
AmpiyTErEs, Mac Leay. 
The antenne consist of ten joints, the three last forming the club. 
The labrum is exposed and lobate. The mandibles are strong and 
scaly. The maxillary lobe is of a moderate size, and its inner side 
armed with corneous teeth. The middle of the superior extremity of 
the mentum is slightly prolonged and truncated, the angles rounded 
and bearing the palpi; their last joint is ovoid, the same of the max- 
illz is much elongated and very cylindrical. The scutellum is large f. 
In the other subgenera of the same division, the mentum forms a 
transverse square, the middle of the superior margin projecting in 
the manner of a tooth, entire or emarginated. The maxille are en- 
tirely corneous and resemble mandibles terminated by a stout, in- 
clined, elongated tooth, either entire and very obtuse at the end, or 
divided there into two or three points. The mandibles are always 
scaly and robust. The labrum is exposed. 
Some, peculiar to Australia, have a sternal point; their tarsial 
crotchets are entire and unequal. Such is the 
AnopLocnatuus, Repsmus, Leach, 
The antenne are composed of ten joints, and the extremity of the 
* Geotrupes excavatus, Fab., the male; Melolontha cornuta, Oliv., Col., I, 5, Vii, 
74, a, b, the male; Scarab. candida, Petag., Insect. Calab., I, 6, a, b, the male; a 
black variety also, observed in Corsica by M. Peyrandeau, and subsequently in Sicily 
by M. Lefevre ;—M. atriplius, Fab., a female of another species. 
+ Mac Leay, Hor. Entom., I, p. 142. This’ gentleman says nothing about the 
crotchets of the tarsi, nor sexual differences. From the description of the species 
which is the type of the genus, the thorax must be destitute of horns, and the ante- 
rior tibiz are tridendate on the outer side; but two teeth are found in the same of 
Pachypus. 
