6 ON THE COLEOPTERA OF AUSTRALIA, 



basal joint very small, the 2nd much larger, subtriangular, the 

 3rd obovate, a little larger than tlie third. Mandibles solid, 

 hornj, and rather sharp at the extremity. Anteunse short, robust, 

 10-jointed, the club composed of six very long lamelhe which are 

 rather strongly curved outwardly towards the apex ; tlie basal 

 joint short, robust, 2nd about half as long as the 1st, rounded in 

 front, 3rd about twice as long as the 2nd, rather broader in front 

 than behind, 4th short, irregularly triangular, and produced into 

 an angular point externally. Prothorax transverse ; anterior 

 margin straight ; feebly bisinuate at the base. Scutellum large, 

 rounded behind. Elytra subovate, strongly convex, broader at 

 the base than the prothorax ; each with a distinct sutural stria 

 and four pairs of rather obscure strite which are effaced posteriorly. 

 Pygidium perpendicular. Legs rather long; anterior tibiae strongly 

 tridentate ; slightly incurved, with the apical spine narrow and 

 acute ; the intermediate and posterior tibije nearly straight, the 

 former a little, and the latter considerably, thickened at the apex, 

 each with a feeble external carina about the middle and an incon- 

 .spicuous dentation between this and the base ; the tarsi longer 

 than the tibias ; the claws strongly dentate at the base. 



This very distinct genus appears to belong to Lacordaire's sub- 

 tribe Macrophyllides, which is chiefly composed of African forms. 

 It has solid horny mandibles, strong toothed maxillae, prominent 

 and articulated labrum, and distinct ventral segments to the 

 abdomen — all characters approximating it to MacrojthyUa and the 

 allied Holophylla ; but the form of the antennae, with their six- 

 jointed club, and the structure of the legs — particularly of the 

 claws — will, I believe, suffice to distinguish it from any genus at 

 present recorded. 



Othnonius Batesii, sp.n. 



Elongate-ovate, rather strongly convex, somewhat shining ; 

 head, prothorax, scutellum, pygidium and legs piceous ; antennae 

 testaceous, except the first two joints which are reddish brown ; 

 elytra reddish castaneous. 



