AMERICAN COLEOPTERA. 335 



ranpo of variation affording an exact means of description. The fol- 

 lowing tiible is presented prepared from a study of my own and Le- 

 conte's specimens. The determinations of the species are those made 

 by Lcconte and the names in all cases refer to the same species in- 

 tended by him in "New Species", p. 79. 



Antcnnre 9-jointod. 



Anterior claw % slightly cleft behind tip; palpi not impressed manca. 



Antennae 10-jointed. 



Anterior claw % not cleft. 



Presternum in front compressed, acute at summit; palpi im- 

 pressed seditiosa. 



Prosternum convex not carinate. 



Last joint of maxillary palpus impressed • puberula 



Last joint of maxillarj- palpus cylindrical not impressed. ...nigricoUis. 

 Anterior claw % cleft sometimes very slightly. 



Antennal club % shorter than the others joints together. 



Pygidium sparsely punctured, hairs short immaculata. 



Pygidium coarsely punctured, rugulose, hairs long hirta. 



Antennal club % longer than the other joints taken together. 



Last joint of maxillary palpus cylindrical villosa. 



Last joint of maxillary palpus fusiform longula. 



Anterior claw % deeply divided elegans. 



The above table is founded on the sexual characters of the male 

 primarily. It is nearly impossible to prepare a table of any value for 

 the other sex. The females are readily known by all their claws being 

 similar and the spurs of the hind tibia3 shorter, broader and stouter 

 than the male. 



C. manca, Lee. Proe. Acad. 1866, p. 382. 



In addition to the characters given by Leconte, the mentum and 

 ligula are broadly and deeply grooved at middle, the latter deeply em. 

 arginate in front and the angles prominent and divergent. The an- 

 terior claw of front tarsus of % is thick and distinctly cleft behind its 

 tip and on the posterior edge. It is our largest species and may form 

 a new genus. 



C. seditiosa, Lee. New Species, p. 79. 



This is one of our most elongate species, and may be known by the 

 anterior claw not cleft and the prosternum in front of coxae strongly 

 compressed and acute at summit. The last joint of maxillary palpus 

 is distinctly impressed. The upper tibial teeth of the anterior pair are 

 very sliort and obtuse. The antennal club is long and equals all the 

 other joints taken together. The clypeus is nearly smooth. 



