COLEOPTERA. 17 
PuitEvrvus, Lat—Gerorrurss, Fab. 
The Phileuri only differ from the Scarabei in their mandibles, 
which are straighter, destitute of sinus or teeth on the outer side, and, 
in their depressed body, the thorax of which is dilated and rounded 
on the sides *. 
Our second division contains Scarabzeides, closely allied to the pre- 
ceding in some respects, but also closely approximating to various 
Melolonthze, and particularly to the Cetonix, which they resemble 
externally, but from which they differ in the arrangement of the 
mouth; Fabricius and Olivier even arranged most of these Insects 
with them. Their body is generally shorter, more rounded, smoother 
than that of the Scarabzei, and decorated with brilliant colours. The 
head and thorax are identical, and without any particular projection 
in both sexes. The anterior margin of the labrum is almost always 
exposed or apparent. The maxille- are entirely scaly, as if trun- 
cated at the extremity, and furnished on the inner side with five or 
six strong teeth. The mentum is proportionally shorter and wider 
than that of the same Coleoptera, and less narrowed superiorly. The 
mesosternum is frequently prolonged into a horn or blunt point, ex- 
tending between the second legs and even beyond them. The scu- 
tellum is usually large. The tarsial hooks are generally unequal. 
With the exception of a small number, these Xylophili are peculiar to 
the equatorial countries of the western continent. 
_ Here, as in all the preceding Scarabeides, we find no axillary 
piece } filling the interval comprised between the posterior angles of 
the thorax and the exterior angles of the base of the elytra. 
We will first speak of those subgenera in which the middle of the 
pectus presents no point or horn. 
Hexopon, Oliv. Fab. 
The body is almost orbicular and plane beneath; the head square, 
and received into a deep emargination of the thorax; the outer mar- 
gin of the elytra dilated and preceded by a small groove; the legs are 
slender, and the hooks of the tarsi very small and equal. 
The labrum is apparent, The antennal club is small. The max- 
ille are strongly dentated {. 
CyciocerHaLa, Lat.—Cuatrrus, Mac L.—Metoiontua, Fab. 
The body ovoid; head free; elytra slightly bordered, without any 
Re a ee ee ee SS ee eS 
* G. dydimus, vulgus, depressus, Fab. Certain undescribed species from Brazil and 
Cayenne, somewhat analogous to Sinodendron, have a thicker body, and connect the 
Phileuri with our Scarabeides, or the Geotrupes of Fabricius, a genus which has 
not been sufficiently studied with respect to the organization of the parts of the 
mouth. 
+ A lateral portion of the sternum larger and thicker than usual, and which, per- 
haps, corresponds to that small rounded scale (the ¢egula of some authors) found at 
the origin of the superior wings of Hymenoptera. See the Mém. sur le thorax des 
Insectes, by M. Audouin. 
+ See Oliy., and Lat., Gener. Crust., II, p. 106. 
