92 GEO. H. nOR\, M. D. 



The following will readily distinguish the males. 

 Sixth* ventral segment pectinate on its hind margin. 



With spongy space on the lower face of the segment at middle. 



Spongy space divided longitudinally, (fig. 5) maeulicollis. 



Spongy space entire, large. 



Covering the entire impression of the segment, (fig. 6) seillirilfus. 



On the centre of the impression only, (fig. 7) ineiiiiionius. 



Without spongy space, merely a few scattered granular tubercles. 



Si.xth ventral broadly and feebly emarginate, the spinules forming a con- 

 tinuous series, (fig. 8) tachyporoides. 



Sixth ventral narrowly and feebly emarginate, spinules arranged in a 

 group on each side of the eiiiargination. 

 Elytra smooth, last dorsal of male normal, abdomen shinin?, very 



sparsely punctured, segments not impressed, (fig. 9) agilis. 



Elytra distinctly punctured. 



L;)st dorsal of male normal, ventral segments not impressed, elytra 



less coarsely punctured, (fig. 10) aiiglistatlis. 



Last dorsal of male tridentate, ventral segments four, five, six. dis- 

 tinctly impressed, elytra coarsely punctured, (fig. 11) <lebilis. 



Sixth ventral verv ileeply emargiriate, tiie angles prolonged. 



The spinules bordering the entire emargination, (fig. 12) ropantllis. 



The spinules divided into three groups, (fig. 13) SCrwSator. 



The S[)inules at the tips of the proces-^es only. 



Processes of s'xth ventral acute. Elytra stnooth. Abdomen sub-npaque, 



finely and rather densely punctulate, (fig. 14) iiiiiiillS. 



Processes of sixth ventral obtuse. Elytra coarsely punctured. Ab- 

 domen shining, sparsely punctulate, ffig. 15) acUeadus. 



Sixth ventral segment not pectinate posteriorly. 



Form parallel, abdomen not narrowed except at tip, (fig. 16)...parallelus. 

 Abdomen gradually narrowed from base to tip. 



Sixth ventral with spongy space on the face of the segment. 

 Abdomen rather coarsely punctured. 



Elytra piceous or rufo-piceous, distinctly punctulate, (fig. 17). 



uij;i*i<*oi*niN. 



Elytra luteous, scarcely visibly punctulate luritlus. 



Abdomen very obsoletely punctured caiiadciisiH. 



Sixth ventral without spongy space on face of segment. 

 First two ventral segments strongly carinate at middle. 



Lacinise of last ventral long and arcuate; last dorsal acutely toothed, 



(fig. 18) fiiiibriatus. 



LacinifE shorter, straight; last dorsal witli short teeth, (fig. 1 ). 



pivipes. 

 First two ventral segments not or feebly carinate at middle. 

 Sixth ventral (som^Jtiinds fifth also), concave, emarginate posteriorly. 

 Posterior margin of sixth ventral emarginate at middle and at sides, 

 (fig. 20) Scliwarzi. 



•In using the above table with European works at hand, it must be re- 

 membered that Erichson, Redtenbacher, Miiklin and others, consider the last 

 ventral as the sixth. There are seven very distinct ventral segments, the first 

 in great part concealed. The sixth of the above table is the equivalent of the 

 fifth of those authors. 



