ROLAND HAYWARD. 51 



distinct; basal impressions small, unistriate; sides with the margin veiy nar- 

 rowly reflexed, arcuate in front, moderately deeply sinuate behind : Jiind angles 

 acute, divergent, not carinate. Elytra about one-half wider than the thorax, 

 oblong-ovate, finely striate; strise entire, finely but distinctly punctate, the punc- 

 tures becoming obsolete towards the tip ; intervals nearly flat, the third with the 

 first dorsal puncture slightly in front of the middle, the second about one-fifth 

 from apex. Beneath dark feneous, shining. Legs nearly black, with more or less 

 aeneous lustre. Length .22-.24 inch ; 5.5-6 mm. 



Smaller, more depressed and less shining than any of the preced- 

 ing species of the group, from which it also differs by the thorax 

 with the sides deej)ly sinuate behind, the basal imjDressions unistriate, 

 and the hind angles more acute and not carinate. The elytra are 

 more finely striate, with the intervals nearly flat. It resembles most 

 closely certain forms of coxendix, but may be distinguished by the 

 thorax wider at base than apex, with the basal fovese unistriate, the 

 hind angles acute, divergent and not carinate, and by the more finely 

 striate elytra and nearly black legs. The differences in the thorax 

 between this and the next species are, as remarked by Dr. LeConte, 

 nearly the same as those exhibited between lorquini and carbmla in 

 the last group. 



I have seen but eight specimens of this species, all collected at 

 Green River City, Wyo., 'by Mr. F. C. Bowditch, to whom I am 

 indebted for the single example in my cabinet. 



13. B. coxendix Say. — Form sliglitly elongate, feebly convex; color 

 bronzed, varying to bluisli black, shining. Head as wide as the thorax at apex, 

 alutaceous : palpi piceous ; antenuie about one-half as long as the body, piceous, 

 the first joint and sometimes the second and third at base rufous. Prothorax 

 about one-half wider than long, not wider at base than apex, finely rugose at 

 base, feebly transversely wrinkled along the median line; apex feebly emargin- 

 ate; median line distinct, abbreviated in front and usually behind ; transverse 

 impressions distinct; basal impressions broad, deep, feebly bistriate, the outer 

 stria smaller and less distinct; sides with the mai'gin very narrowly reflexed, 

 moderately arcuate in front, sinuate behind : hind angles slightly prominent, 

 subacute, very finely or obsoletely carinate. Elytra about one-third wider than 

 the thorax, oblong-ovate, deeply striate; striae deeply punctate, less distinctly 

 towards the apex ; intervals convex, the third with the first dorsal puncture about 

 the middle, the second about one-fifth from apex. Beneath dark feneous, shining. 

 Legs feneo-piceous, the femora at base and the tibiae rufous. Lengtli .22-. 26 inch ; 

 5.5-6.5 mm. 



This species varies in color as indicated above. Fi'om the next, 

 which was described by Dejean under the name nitidulum, it seems 

 distinct by the characters above given, while from the others of the 

 group it may be distinguished by the thorax not wider at base than 

 apex. Nearly black specimens bear considerable resemblance to 

 botvditchi. 



TRANS. AM. ENT. SOC. XXIV. FEBRUARY, 1397. 



