M4 RHINOTMETUS. 



joint is short, conical, its base being much smaller than the apex of 

 the third joint, and its length being greater than its breadth. 



Labial palpi (Front, fig. 4 n, 5 n) minute ; the basal joint attenu- 

 ated ; the second broader, and transversely truncate ; the apical joint 

 minute, shorter and much narrower than the second. 



Antennas robust, filiform, tolerably approximate, situated below and 

 within the inner margin of the eyes ; the basal joint dilated (in some 

 species more than in others) ; the second is short and ovate, narrower 

 than the first ; the third is not broader than the second, of equal 

 length with the first ; the rest are subequal, slightly shorter as well 

 as broader than the third, parallel, rounded at the base and truncate 

 at the apex ; the terminal joint is more attenuated and produced. 



Eyes large, subglobose, situated at the side of the head, at some 

 distance from the base. 



Head (Front, fig. 3 h) narrower than the thorax, elongated, broadly 

 produced in front : this apical elongation varies in different individuals 

 in length, but is in all instances very marked, as compared with the 

 form of Monoplatus and other allied genera. 



Tliorax elongate, attenuated in front, distinctly broader than the 

 head, but narrower than the elytra ; the anterior angles are more or 

 less depressed ; the sides are always tolerably parallel (except at the 

 apex, where they are constricted, and rounded at the angle) and 

 evenly submarginate ; the anterior margin is rounded more or less, 

 never in any degree emarginate ; and the anterior angles are rounded 

 (not, as in Tetragonotes, distinctly acute); the surface is either glabrous 

 or pubescent. 



Scutellum triangular, occasionally subcordiform, generally im- 

 punctate, and placed below the plane of the elytra. 



Elytra much broader than the thorax, subparallel, or in some 

 species robust, punctate-striate, with an antemedial transverse de- 

 pression (which is more or less distinct) extending obliquely upwards 

 towards the shoulders, and giving an appearance of prominence to 

 the scutellary angles ; the surface is generally punctate-striate. 



Legs sufficiently robust ; when seen under a high power, subpubes- 

 cent for the most part. The anterior femora subcylindrical, of nearly 

 equal breadth throughout. The tibias (Front, fig. 5 b) are inflected 

 immediately at the base, straight, gradually and slightly incrassated 

 towards the apex; at the apex itself (when seen from above) attenu- 

 ated. The tarsi (Front, fig. 5 d) are shorter than the tibia ; the 

 basal joint short and broad (not broader than the dilated part of the 

 tibia) ; the second of the same form as the first, but smaller ; the 

 third distinctly bilobed, the breadth being greater than the length ; 

 these three basal joints are densely fringed with thick pubescence ; the 



