118 GEO. H. HORN, M. D. 



The male has not the tubercle as in the preceding species, merely a 

 feeble longitudinal impression. 



B. pccci/us, Mann., is said by Fauvel to be the same as this species 

 but may prove distinct, there appears to be at the tip of the sixth 

 segment a small tubercle. If this character is a permanent one the 

 species is distinct. 



Distribution extended. Massachusetts, Canada, Michigan, A^an- 

 couver, Alaska, Pennsylvania, and District of Columbia. 



B. obHOIcttlN, Say. — Black, shining, thorax and elytra rufo-testaceous, 

 elytra with large black spot in each outer apical angle, legs testaceous. Head 

 oblong oval, smooth, black, shining. Antennae piceous, four basal joints paler. 

 Thorax rufo-testaceous, smooth, shining, as wide at base as the elytra, hind 

 angles broadly rounded. Elytra as wide as long, dorsal series of fine punc- 

 tures, sutural and lateral series nearly obsolete, color rufo-testaceous, shining, 

 a large black spot in each outer apical angle, covering the entire epipleurje, 

 not attaining the apical margin. Abdomen pitchy black, apices of segments 

 paler, the apex of the sixth and base of seventh conspicuously rufous, surface 

 sparsely punctate. Body beneath black, abdomen more distinctly punctured. 

 Legs and anterior coxse testaceous. Length .18 — .26 inch; 4.5 — 6.5. 



I am unable to detect any sexual differences. 



Resembles the next species, but the color of the abdomen and the 



shorter head distinguish the present. 



Occurs from Virginia to Texas. 



O. ciiiclu!^, Grav. — Eufous, shining, head, body beneath, a large spot on 

 each elytron and last two abdominal segments black. Head elongate oval, 

 smooth, shining. Antennae piceous, apical and four basal joints testaceous. 

 Thorax rufous, shining, as broad at base as the elytra, hind angles broadly 

 rounded. Elytra as broad as long, discal row with three or four punctures, 

 sutural and lateral nearly obsolete, color bright rufous with a large black spot 

 attaining the sides but not the apex. Abdomen rufous, very sparsely punc- 

 tured, last two segments black. Body beneath black, abdomen rufous. Legs, 

 anterior coxse and apical half of middle testaceous. Length .18 — .28 inchj 

 4.5 — 7 mm. 



Male. — Anterior tarsi very feebly dilated, seventh ventral segment truncate. 



Female. — Anterior tarsi simple, last ventral elongate oval. 



Variations occur having a narrow basal black band on the elytra, 

 others without the basal band have the two ely^ral spots united at the 

 suture forming a continuous band, {gentilis, Lee). 



Occurs nearly everywhere east of the Rocky Mountains and extends 

 westward to British Columbia. 



B. l<>ngiccp!>i, Lee. — Pitchy black, shining, elytra, basal margin of thorax 

 and legs rufo-testaceous. Head black, shining, twice as long as wide. Antennae 

 longer than head and thorax, piceous, basal joint paler. Thorax scarcely wider 

 than long, narrower at base than tlie elytra, hind angles obtuse, color black, 

 base narrowly, sides at basal half more widely margined with rufo-testaceous. 



