80 AMERICAN COLEOPTERA. 



tervals convex. Beneath brownish or piceous, shining. Legs pale yellowish 

 testaceous. Length .24-.28 inch ; 6-7 mm. 



One of the best marked species of the group. The submarginal 

 spot on the elytra extends very obliquely towards the suture, in some 

 specimens being so dilated as to extend over the entire apex. In 

 one example that I have seen, which seems referable to this species, 

 it is entirely wanting. The five inner strise of the elyti'a are entire, 

 although so extremely fine at tip in some specimens as to be very 

 difiicult to trace. 



It appears to be most nearly related to himneukdum, but is more 

 convex, with the thorax more narrowed behind, and the strite of the 

 elytra deeper and dilated at base. It differs also in the color of the 

 legs, antennae and palpi. 



It is extremely local. I have seen specimens only from Lowell, 

 Mass. (Blanchard), New York, Pennsylvania and Illinois. Accord- 

 ing to Dr. Hamilton it is abundant at Allegheny, Pa. 



50. B. ustulatum Linn. — Form slightly elongate, convex ; color greenish 

 black, shining, the elytra with a well-defined pale spot at base, originating on the 

 humerus, and another submarginal one about one-third from apex, extending 

 slightly obliquely towards the suture. Head as wide as the thorax at apes ; palpi 

 rufous, slightly darker at tip; antennse about one-half the length of the body, 

 fuscous,' the basal joints rufous. Prothorax nearly one-half wider than long, 

 narrower at base than apex, sparsely punctate at base ; apex slightly emarginate ; 

 median line distinct, abbreviated in front and sometimes also behind ; transverse 

 impressions distinct ; basal impressions small, deep, bistriate; sides with the mar- 

 gin very narrowly reflexed, arcuate in front, suddenly constricted and sinuate 

 behind ; hind angles rectangular, carinate. Elytra about one-half wider than the 

 thorax, oblong-oval, moderately deeply striate, less deeply at sides and apex, the 

 five inner striae entire, the fifth grooved at tip; third stria with the first dorsal 

 puncture about one-third from base, the second about one-third from apex ; inter- 

 vals convex. Beneath black, shining. Legs rufo-testaceous. Length .21-.25 

 inch ; 5.25-6.25 mm. 



Easily recognizable by its markings from all except lucidum.. 

 From this latter species it may be distinguished by its more convex 

 form, with the thorax proportionally narrower at base than apex, 

 and with the sides more strongly arcuate in front and more deeply 

 sinuate behind. The elytra are more deeply striate with the stride 

 more deeply punctured and the intervals more convex. 



It is very widely distributed, occurring locally throughout the 

 greater part of the region east of the Rocky Mountains, and also in 

 Europe and western Siberia. 



