C DESCRIPTIONS OF NEW SPECIES. 



Pennsylvania ; Rev. I). Ziegler : Tampico, Mexico ; Mr. H. 

 Haldeman. Larger and narrower than P. timidus, with the tho- 

 rax less transverse, and more quadrate, being only a little narrower 

 at the apex than at the base : the sides of the thorax are not 

 broadly depressed as in the other species, but only moderately 

 margined. 



BLECHRUS MOTSCH. 



16. 15. pusio. Elongatus, nigro-seneus, thorace latitudine hand bre- 

 viore, trapezoideo, postice angustato, lateribus antice paulo rotundatis 

 postice vix sinuatis, angulis posticis obtusis haud prominulis, elytris 

 thorace latioribus stria suturali obsoleta notatis. Long. -08. 



Louisiana ; Mr. Ulke. Much smaller than B. lucidus, with the 

 sides of the thorax less rounded, and the hind angles more obtuse, 

 than in any of our other species. 



TETRAGONODERITS DEJ. 



I 1 ?. T. imdulatus. Subtus testaceo-piceus, capite thoraceque nigro- 

 viridibus subnitidis, hoc latitudine sesqui breviore, trapezoideo, lateribus 

 antice rotundatis postice obliquis, angulis posticis obtusis haud rotun- 

 datis, planiusculo, linea dorsali profunda, basi utrinque vage impresso, 

 elytris irregulariter nigroseneo-variegatis fascia, antica et postica inter- 

 ruptis pallidis relictis, anteunis palpis pedibusque pallidis. Long. -21. 



Cape San Lucas, Lower California ; Mr. Xantus. This species 

 has precisely the same elytral markings as T. fasciatus, but the 

 thorax is broader, flatter, and the basal impressions are much less 

 deep. 



CYM5NUIS LATR. 



18. C. planipennis. Rufo-picea, parce pubescens, capite parce 

 punctato, thorace latitudine fere sesqui breviore, postice modice angus- 

 tato, lateribus pallidioribus late marginatis postice haud sinuatis, an- 

 gulis posticis obtusis, disco parce haud profunde punctato, basi profunde 

 impresso magis punctato, elytris planiusculis subopacis, postice inde- 

 terminate obscuris, striis impunctatis, interstitiis disperse punctulatis, 

 antennis pedibusque ferrugineis. Long. -43. 



New Mexico ; Mr. Ulke. Resembles C. reflexa, but the thorax 

 is much less strongly punctured, the hind angles are more obtuse, 

 and the striae of the elytra are impunctured. 



19. C. lilldsonica. Obscure rufo-picea, parce pubescens, capite 

 thoraceque grosse sat dense punctatis, hoc latitudine fere sesqui breviore, 



