6 MEMOIRS ON THE COLEOPTERA 



Elytral striae distinctly and normally punctate II 



6 The striae very unequal to wholly obsolete, always gradually fine to 

 broadly obsolete externally 7 



The striae coarse and deeply impressed, entire; body oblong and very 

 convex 10 



7 Elytra never having paler maculation 8 



Elytra each with two clearly defined pale spots, the surface very smooth, 

 the striae frequently wholly wanting 9 



8 Body convex, the general aspect in typical forms somewhat as in 

 the nitidum group, except that the prothorax is always much nar- 

 rower than the elytra; striae only visible or distinct suturad as a 

 rule V (erasum} 



Body strongly depressed, oblong, the elytral striae well impressed and 

 subequally distinct throughout the width, entire as a rule; body 

 usually black throughout, never with distinct metallic lustre. 



VI (planatum) 



9 Body only moderately convex, small, the general aspect as in the 

 ustulatum group, the prothorax subcordate VII (bifasciatuni) 



10 General aspect somewhat as in the ustulatum group, the two dorsal 

 punctures at the third stria, as in the three preceding; body testa- 

 ceous throughout, the elytra with cloud-like dusky maculation, ob- 

 long, the prothorax but little narrower than the elytra; antennae 

 unusually thick VIII (tigrinum) 



II The two or three dorsal setigerous punctures on or adhering to the 

 third stria 12 



The dorsal punctures on the third interval, sometimes, however, as in 

 the vile section of the variegatum group, rather close to the third 

 stria 15 



12 Intervals without punctures of any kind 13 



Intervals with a single series of minute setigerous punctures 14 



13 Hind body always much wider than the prothorax, the latter diver- 

 sified in form but, typically, subcordate; coloration also varied. 



IX (ustulatum) 



Hind body barely at all wider than the prothorax, the general form more 

 cylindric; elytra pale, with darker marking X (ephippigerum) 



14 Prothorax cordate; elytral margin not at all incurved at the humeri. 



XI (semistriatum) 



15 Frontal sulci subparallel to oblique, but never in contact at the 

 anterior margin 16 



Frontal sulci very strongly converging, in mutual contact at apex. . . . 18 



16 Body oblong, greatly diversified in size, convexity, coloration and 

 outline of the prothorax, the basal angles of which are always 

 sharply marked XII (variegatum) 



Body oblong-oval, the prothorax never much narrower than the elytra, 

 with rounded sides and obsolete basal angles, the basal margin 

 thickly beaded as in the quadrimaculatum group; posterior of the 

 two dorsal punctures submedially situated on the third interval, 

 the anterior more or less adherent to the third stria. 



XIII (sphcsroderum) 



Body ventricose, always notably small in size, the elytra much wider 



