OF NATURAL HISTORY. 657 



4. B. OBLITERATA.— Elytra with obsolete grooves; lateral 

 margin rounded. 



Inhabits Mexico. 



Body black, immaculate : head slightly punctured ; an impres- 

 sed line between the antennae : thorax wider than long ; lateral 

 edge a slightly elevated line, a little excurved at the posterior 

 angle, which is consequently somewhat acute : elytra with obso- 

 lete grooves, minutely punctured; lateral margin rounded and 

 smooth : thighs not obviously punctured. [185] 



Length less than three-fifths of an inch. 



Resembles the preceding, but differs in the eseurvature of the 

 lateral thoracic edge near the posterior angle, and in the grooves 

 of the elytra being obsolete. 



5. B. CELSA. — Body somewhat elongated ; elytra with traces 

 of grooves and punctures. 



Inhabits Mexico. 



Body brownish-black, minutely punctured, somewhat elongated: 

 head with the impressed line between lihe antennae obsolete: an- 

 tennae at tip, and palpi piceous : thorax rather wider than long ; 

 lateral edge a slightly elevated line, not excurved at the posterior 

 angles; an obsolete, abbreviated, oblique, impressed line near 

 the posterior angles ; somewhat attenuated behind ; lateral margin 

 rounded. 



Length more than three-fifchs of an inch. 



More slender than the maura and ohliterata, which have no 

 appearance of an indentation near the posterior angles of the 

 thorax. 



6. B. ^QUALis.— Elytra smooth, simple; thoracic basal angles 

 rot excurved. 



Inhabits Mexico. 



Body black, minutely punctured : head with the impressed 

 line between the antennae, obsolete : thorax broader than long, 

 broadest in the middle ; lateral edge a slightly elevated line, not 

 at all excurved near the posterior angle; elytra destitute of any 

 appearance of the rudiment of a groove or of striae ; rounded on 

 the lateral margin. 



Length over three-fifths of an inch. 

 1835.] 42 



