191 



1873.] J- — i [Horn. 



Fifth segment of abdomen with one tooth at middle. 

 Elytra prolonged at apex especially in 9 • 



Abdomen at middle cristate @ aculeatus. 



Abdomen of § not cristate subsignatus. 



Elytra similar in the sexes, not prolonged. 

 Abdomen cristate § . 



Elytra with well-defined black spots pantheriuus. 



Elytra with spots indistinct peregrin us- 



Elytra entirely testaceous immaculatus. 



Abdomen not cristate § . 



Head testaceous ; abdomen testaceous exiguus. 



Head bronzed ; abdomen piceous exilis. 



Fifth segment of abdomen bidentate at middle : abdo- 

 men never cristate. 

 Thorax twice as wide as long, sides arcuate. 



Strife of elytra nearly obliterated on the disc infuscatus. 



Striae strongly impressed and punctured on the disc. striat u s . 



Thorax not twice as wide as long, sides nearly straight. 

 Stria) deeply impressed, very coarsely punctured. . . rugulosus. 



B, styliferus, n. sp. 



Head black with aeneous surface, coarsely punctured, vertex finely 

 sub-car inate. Thorax more than twice as wide as long, sides nearly 

 straight, anterior angles rounded, disc moderately punctured, shining 

 with a median double vitta ; color pale testaceous. Elytra shining, very 

 finely striate, strise finely punctured, punctures of the outer stria) 

 coarser, intervals nearly smooth on the disc ; color pale testaceous, obso- 

 letely maculate with fuscous. Body beneath black, legs entirely pale 

 testaceous. Mesosternal crest at apex produced into a long slender style- 

 Abdominal segments not carinate in the male, fifth segment at apex 

 emarginate, middle of emargination with broad short lobe not dentiform. 

 Length .20 inch ; 5 mm. 



Very closely resembling superficially the California varities of B. infux- 

 catus (var calif or nicus), but maybe at once distinguished by the rounding 

 of the bottom of the emargination of the fifth abdominal segment, and by 

 the long slender style into which the mesosternal plate is produced. 



One g specimen, Colorado, kindly loaned by Mr. G. R. Crotch. 



B. aculeatus, Lee. Proc. Acad. 1855, p. 363. 



Color pale testaceous, head black with bronzed surface, coarsely punc- 

 tured, vertex sub-carinate. Thorax less wide than twice the length, sides 

 nearly straight, surface coarsely but sparsely punctured but more densely 

 at the sides ; color testaceous, immaculate. Elytra deeply striate, stria? 

 coarsely punctured, those at the sides deeper and more coarsely punc- 

 tured, intervals feebly convex, irregularly biseriately punctulate ; apex 

 acute § and more decidedly prolonged 9 ; color testaceous with four 

 indistinct fuscous spots on each elytron, one humeral, two at the middle 

 a. p. s. — vol. xin — p 



