OCT0GON0TES. 150 



Elytra sat robusta, parallela, ad apicem rotundata, punctato-striata. 



Pedes robusti, tibiis posticis simplicibus, haud calcare armatis, mar- 

 ginatione retro svhsinuata. 



Labrum broad, subcircular. 



Mandibles (Tab. VI. fig. 5 o) robust, subeonvex, broad, at the apex 

 attenuated and produced into a sharp tooth ; on the inner surface are 

 two angulated depressions, which form a second, much smaller and 

 more obtuse tooth. 



Maxillary palpi (Tab. YI. fig. 5 m) globose ; the basal joint minute, 

 almost obsolete ; the second short, gradually thickened towards the 

 apex, where it is broadly obliquely truncate ; the penidtimate is in- 

 flated, much thicker and shorter than the second, increasing in dia- 

 meter towards the apex ; the apical joint is subulate, circular, and 

 flattened, not acute, or conical. 



Labial pcdpi (Tab. VI, fig. 5 n) minute, elongated ; the second joint 

 subcylindrical, broader than the first ; the apical attenuate. 



Antenna} filiform, robust (in the males very much elongated) ; the 

 basal joint produced, and dilated towards the apex ; the second short, 

 ovate (these two joints in the 5 less dilated and smaller than in 

 the 3 ) ; the third, fourth and fifth subequal (in the $ slightly atte- 

 nuate). 



Eyes large, situated at the base of the head, not extending late- 

 rally so far as the anterior angles of the thorax ; in the males glo- 

 bose, in the females less prominent. 



Head short, hardly produced in front, almost vertical. 



Thorax broader than the head, transverse (in the males less trans- 

 verse than in the femalec), constricted towards the apex ; the sides 

 marginate, the margination being produced antemedially (more or 

 less distinctly) into an obtuse angle. 



Scutellum large, triangular, rounded at the apex. 



Elytra broad, robust, in the males slightly more attenuate than in 

 the females, rounded at the apex, punctate-striate or punctate, 

 clothed more or less with fine pubescence. 



Legs : the anterior femora robust. The tibia incurved at its im- 

 mediate base, gradually thickened towards the apex ; at the extreme 

 apex (below the insertion of the tarsus), on the under side, it is 

 armed with a series of closely arranged comb-like teeth. The tarsus 

 (Tab. VI. fig. 5 d) is broad and short ; the basal joint contracted at 

 the base, and triangular ; the second is of the same form, but larger 

 in dimensions ; the third is broadly transverse, depressed medially, 

 not bilobed; from its centre proceeds the terminal joint, which is 

 elongate, gradually incurved and incrassated towards the apex : the 



