334 COLEOPTERA OF NORTH AMERICA. 



is densely punctured, brown or blackish, with the scutellum, a 

 narrow oblique band composed of two spots about the middle, 

 and a wider transverse one behind the middle not extending to 

 the suture, of white pubescence. 



The relations of this and the preceding tribe with the Ana- 

 glyptus group of Clytini are quite obvious. 



Tribe VI.— MONOHAIHMIWI. 



I have given to this tribe a greater extension that that pro- 

 posed by Lacordaire, who restricted it to those genera in which 

 the scape of the antennae has a large cicatrix, limited by a raised 

 line. The relations between Ptychodes and Dorcaschema are so 

 obvious that they cannot be naturally separated. The tribe as 

 thus enlarged may be denned as follows : — 



Front large, vertical, quadrate, flat ; genae long ; support of 

 labrum large, coriaceous ; mandibles flat ; palpi slender, filiform, 

 pointed ; eyes somewhat finely granulated, emarginate, lower lobe 

 variable in form. Antennae longer than the body, very long in 

 the % , except in Goes and Cacoplia, scape rather stout, with a 

 terminal cicatrix, except in Dorcaschema. Prothorax with or 

 without a lateral spine, elytra narrowed behind, or cylindrical, 

 wings perfect. 



Front coxae angulated, with distinct trochantin, middle coxal 

 cavities widely open externally ; metasternum longer than the 

 first ventral segment (as in all the following tribes) ; the iuter- 

 coxal process acute ; middle tibiae with a distinct tubercle on the 

 outer margin ; tarsi not elongated, last joint large, claws not fully 

 divaricated, but somewhat moveable as in Cerambycidae genuini. 

 The last ventral segment is truncate in both sexes, but more so 

 in the ? . 



Three groups exist in our fauna. 



Legs long, the front pair elongated in £ , and the antennae much longer 

 than the body ; 



Prothorax with lateral spines. Monohammi. 



Prothorax cylindrical. Ptychodes. 



Legs equal, not elongated. Goes. 



Group I. — Monohammi. 



Several species of Monohammus represent this group in various 

 parts of the country ; they affect the wood of pine trees. The 



