AMERICAN COLEOPTERA. 127 



In B the tooth is acute, spiuiform at tip and recurved, the thorax 

 rather suddenly constricted behind it so that the posterior border of 

 the tooth does not approach the base obliquely. 



The species are more numerous than in A and in this respect 

 reverse the condition of the Amazon forma. 

 Elytra fasciate. 

 The fascia behind the middle, incomplete, broadly interrupted by the suture. 



(PI. ir, fig.3) signatns Lee. 



The fascia broad, black and entire, oblique on each elytron, tip not black. 



(PI. ir, fig. 4) querci Fitch. 



The fascia broad, black and entire, transverse, the apex also black. 



(PI. II, fig. 5) facetus Say. 



Elytra cinereous, maculate on each with six round black spots, thorax with 



four spots. (PL II, fig. 6) regularis Lee. 



L. symmetrknis Hald., makes the nearest approach to Liopus. Thi. 

 other species, querci and /g.cetus particularly, lead to Hyperplatys. 



HYPERFL,ATYS Hald. 



In well preserved specimens the antennae are distinctly fimbriate 

 beneath. The pro- and mesosternum are narrow as in Lepturges. 

 The elytra are flattened on the disc, the sides abruptly declivous and 

 limited by an acute ridge, the tip is obliquely emarginate, the outer 

 angle of the emargination more or less spiniform. The first joint of 

 the hind tarsi is as long as the three following together. 



This genus is more closely related to Lepturges than to Liopus near 

 which Lacordaire places it, and whether Lepturges is really distinct 

 can only be determined by a study of Mr. Bates species. 



The species as at present known are distinguished in the follow- 

 ing manner : 

 Body above maculate. 



Elytra twice as long as wide at base. Antennae in both sexes twice (or more), 

 as long as the entire body aspersiis Say, 



Elytra broader, not twice as long as wide. Antennse even in % not twice as 



long as the body luaciilatiis Hald. 



Body above black. 



Elytra as in maculatus, the outer angle of the tip prolonged in a longer spine. 

 Antennae not twice as long as the body feilioralis Hald. 



The last may possibly be a variety of maculatus. 



Group III. — Acantlwcini. 



There is no character separating this group from the Liopi except 

 the presence of an ovipositor in the female. 



The genera here admitted do not differ from those given in the 

 "Classification" (p. 339), except the removal of Mecotetartus (Eutes- 

 sus) and the division of Graphisurus. 



