24 Mr. J. O. Westwood on the 
minutis, tuberculo obtuso frontali, prothorace rude punc- 
tato, excavatione profunda in parte media antica utrinque 
tuberculis duobus elevatis armato, elytris magis piceis, punc- 
tis minutis numerosis et irregularibus notatis, femoribus 
subtus magis castanelis, tibiis anticis tridentatis. 
Long. corp. lin. 10. 
Syn. Cryptodon cribrarius, Dupont MSS. 
Habitat in Senegallia ? 
In Mus. Dom. Hope. 
Actrnozotus, West. (Plate II., fig. 2, and details.) 
Subgenus novum, e genere Phileuri. 
Corpus oblongo-ovatum, convexum. 
Caput subsemicirculare, margine antico elevato, et in lobos 5 
rotundatos diviso. Antenne breves, 10-articulate, articulo 
Imo lato, 2ndo sequentibus majori. Os inferum mento magno 
obtectum. Labrumcrustaceum, transversum, setosum, lateri- 
bus rotundatis. Mandibule mediocres, cornez, apice acute 
curvate, margine externo eminulo, et mento haud obtecto, 
intus inermes. Mazille lobo apicali 6-dentatz, dentibus 
tribus infimis in serie transversa positis, lobo interno inermi. 
Mentum magnum, subquadratum, margine antico emargi- 
nato, parte antica declivi; labium et palpos labiales (articulo 
apicali excepto) obtegens ; labium internum e lobis duobus 
membranaceis ciliatis constans. Palpi labiales breves, 
$-articulati, articulis duobus basalibus internis, ultimo lon- 
giori, apice detecto. Prothorax transversus, convexus, late- 
ribus rotundatis. Elytra convexa, striato-punctata. Pedes 
Phileuri, tarsorum quatuor posticorum articulo basali majori, 
apice supero in spinam producto. Onychie pedum antico- 
rum breves, haud setigeree, quatuor posticorum longe, tenues, 
apice setigero. 
The type of this subgenus recedes still further from Phileurus 
than the preceding; the large 5-lobed clypeus concealing all the 
mouth, which is placed in the middle of the under-surface of the 
head, the form of the labrum, which is transverse, instead of 
being deeply bilobed, and the more arched mandibles, are suffi- 
cient at once to distinguish it from the type of Phileurus. 
With Cryptodus we find it to agree in the dilated clypeus, con- 
cealing the mouth, which is placed on the underside of the head, 
the general structure of the different parts of the mouth, the 
dilated basal joint of the antennae, and the form of the basal joint 
