ROLAND HAYWARD. 45 



base as compared with that apex. In some examples that I have 

 seen, especially from the Pacific coast, the hind angles have a very 

 short, feeble carina. It is, however, by no means constant in speci- 

 mens from that region and gradnally fades away, until in a large 

 series all traces of it vanish. The depth of the sinuation of the 

 sides of the thorax behind is also somewhat variable, and the hind 

 angles vary from nearly rectangular to subacute, the latter variation 

 being usually correlated with the depth of the sinuation. 



B. lacustre Lee (Ann. Lye, 1848, iv, p. 451) cannot be regarded 

 as distinct, it only differing in having the thorax slightly longer and 

 more deeply sinuate behind, and the elevated smooth spaces of the 

 elytra somewhat less extended than in average specimens. 



From our other species of the group, except inKqiiale, it differs 

 by the sinuate fourth stria of the elytra. From inceqitale it may be 

 distinguished by its usually larger size, less convex and broader form, 

 and by its proportionally wider thorax, which is slightly wider at base 

 than apex. The elytral striaj are less deep and more finely punctured. 



Its range of distribution is very extended. It occurs in Canada, 

 Michigan and the Liake Superior region, Manitoba, Colorado, Wyo- 

 ming, Utah, California, Oregon, Washington and British Columbia, 

 and in the old w^orld throughout- a large part of Europe and in 

 Siberia. 



6. B. carinula Chaud. — Form broad, slightly depressed ; color varyino; from 

 coppery bronze to nearly black. Head slightly narrower than the thorax at apex, 

 alutaceo-granulate; palpi seneo-piceous; antenuse rather less than one-half the 

 length of the body, teneo-piceous, the first joint, and sometimes the second and 

 third at base more or less rufons. Prothorax feebly convex, nearly twice as wide 

 as long, not wider at base than apex, alutaceo-granulate except on the disc, 

 slightly rugose at base and apex, more or less transversely wrinkled along the 

 median line: apex slightly emarginate; median line distinct, abbreviated in 

 front; transverse impressions distinct: basal impressions broad, deep, bistriate; 

 sides with the margin very narrowly reflexed, arcuate in front, deeply sinuate 

 behind ; hind angles prominent, subacute, carinate. Elytra about one-half wider 

 than the thorax, oblong-ovate, modei^ately finely striate, the surface finely granu- 

 late with elevated smooth spaces confined to the third interval : stride, finely punc- 

 tate, the fourth straight ; intervals nearly flat, the third with the first fovea at or 

 slightly behind the middle, the second about one-fourth from apex. Beneath 

 dark jeneous, shining. Legs varying from aeneo-piceous to seneo-testaceous- 

 Length .22-.28 inch ; 5.5-7 mm. 



A very pretty species, distinct from the others of tlie group by the 

 proportionally broader thorax with the sides more strongly arcuate 

 in front and more deeply sinuate behind, the hind angles distinctly 

 carinate, and the basal foveie distinctly bistriate. The elytral inter 



TKANS. AM. ENT. SOC. XXIV. FEBRU.\RY, 1897. 



