114 GEO. n. HORN, M. T>. 



Elytra unicolored, rufous intriisiis. 



Antennie slender, joints not transverse ciiigulatus. 



6. — Thorax in part piceous or black. Head oval. 



Disc entirely piceous, lateral and basal margins narrowly testaceous. 



eincticollis. 



A large black spot in each anterior angle, the two confluent at middle. 



auticus. 



Thorax entirely rufous or rufo-testaceous. 



Head oval, scarcely longer than wide. 



Dorsal series of elytra with few punctures pygina^us. 



Dorsal series with many punctures trinotatus. 



Head much longer than wide. Dorsal series with few punctures. 



obsolctas. 



6. — Head elongate, dorsal series with few punctures ciiictus. 



7. — Thorax black, lateral and basal margins testaceous ; legs pale. ..longiceps. 

 Thorax entirely black; legs pitchy black qiia^sitor. 



B. niger, Grav. — Black, shining. Head smooth, black, shining, oval. 

 Antennae piceous, terminal and two basal joints paler, as long nearly as head 

 and thorax, first three joints cylindrical, five to ten flattened and decidedly 

 transverse, eleventh longer, oval at tip. Maxillary palpi moderately elongate 

 and slender. Thorax smooth black, shining, not wider than the elytra, nar- 

 rower in front, hind angles broadly rounded. Elytra as long as %vide, slightly 

 broader at apex than base, smooth black, shining, the punctures of the three 

 rows almost obsolete. Abdomen black, shining, apical margin of penultimate 

 segment often paler, surface sparsely punctured and pubescent, the first three 

 visible segments smoother at middle. Body beneath and legs black, abdomen 

 sparsely and evenly punctured.' Length .28 — .46 inch; 7 — 11.5 mm. 



Male. — Sixth ventral tricarinate at middle, the middle carina short; between 

 the ends of the outer carina' the edge is slightly emarginate. 



Female. — Abdominal segments simple. 



Variety. — Smaller forms occur of piceous or rufo-piceous color not diff"ering 

 however in any essential character from the normal form. 



Occurs in Pennsylvania, Canada, Michigan, Illinois, but is not 



common anywhere. 



B. axillaris, Grav. — Pitchy black, shining, legs piceo-testaceous, elytra 

 with narrow border at tip also a broad dorsal stripe testaceous. Head elongate 

 oval, smooth, black, shining. Antennae longer than head- and thorax, piceous, 

 basal joint testaceous, joints five to ten moderately transverse. Palpi moder- 

 ately elongate and slender. Thorax slightly broader than the base of the 

 elytra, narrowed in front, hind angles broadly rounded, surface smooth black, 

 shining. Elytra as long as wide, the sutural row of punctures very fine, discal 

 row of five more distinct, lateral series more numerous. Abd6men as in niger. 

 Body beneath black, shining, abdomen coarsely punctured. Length .20 — .28 

 inch ; 5 — 7 mm. 



Male: — Sixth* ventral segment with a small dentiform carina at middle. 



Female. — Abdominal segments simple. 



This species is easily known by the ornamentation of the elytra. 

 Occurs in the Gulf States, not common. 



* EricLson says the fifth, but erroneously. 



