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North American Coleopterous Insects. 185 



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Len2:th less than three fifths of an inch. 



Resembles the preceding, but difFers in the excurva- 

 ture 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 the 

 antennse obsolete : antenna at tip, and X'^^lpi 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: elytra with a slight appearance of 

 grooves; soraew^iat attenuated behind; lateral margin 



rounded. 



Length more than three fifths of an inch. 



More slender than the mama and obliterata, which 

 have no appearance of an indentation near the posterior 

 angles of the thorax. 



6. B. aqudJis. Elytra smooth^ simple ; thoracic basal 



angles not excurved. 



Inhabits Mexico. 



Body black, minutely punctured : head with the im- 

 pressed 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 pos- 

 terior angle : elytra destitute of, any appearance of the 

 rudiment of a groove or of strise ; rounded on the lateral 



margin. 



Length over three fifths of an inch. 



Shorter and more robust than B. celsa, Nob. ; allied 



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