82 MONOÖBAPHICAL ESSAY ON THE 



Head plain , generally of moderate size , occasionally large ; 

 epistema very short, broadly semicircularly emarginated; labrum 

 transverse, slightly incised; antennary cavities small and rounded ; 

 eyes large, widely separated on the vertex. Antennae of variable 

 length and shape, rather long and slender, in some species very 

 long; sometimes hardly, sometimes distinctly _serrated; 1st joint 

 long, thickened at the top, 2nd very small, obconic, 3rd slightly 

 longer than the following, the remainder almost of equal length, 

 flattened, more or less broadened at the apices. 



Prothorax transverse, convex, rounded at the sides, narrowed 

 towards the top , very deeply notched on both sides at the base , 

 with the median lobe and the hinder angles strongly projecting 

 and pointed. 



Scutellum invisible. 



Elytra rather convex, broadly bi-lobated at the base, the lobes 

 acutely produced and overreaching the base of the thorax , gradually 

 narrowed towards the top , diverging at the suture ; the apex of each 

 ending in a strong sharp point , formed by a lateral emargination , 

 which forms also a strong , rarely an obsolete , lateral tooth ; enlarged 

 below the shoulders, the dilatation sometimes short and rounded, 

 sometimes long and angular, covering a small part of the breast. 

 Legs rather robust ; tarsi long and slender , the first joint long , 

 sometimes almost as long as the other joints together. 



Metasternum broadly but shallowly emarginated; mesosternum 

 short; prosternum broad, flat, rarely somewhat convex or concave. 

 General shape rather convex , gradually narrowed anteriorly and 

 chiefly posteriorly. 



In the memoir, I published two years ago, I have arranged 

 the few species known at that time in two groups, according to 

 the shape of the humeral dilatation of the elytra. The knowledge 

 of a larger number of species proves , however , that this characteristic 

 is quite unsatisfactory to arrange them according to their true 

 affinities; although the shape of that humeral dilatation remains 

 of great interest for specific distinction, it is useless for dividing 



