122 AMERICAN COLEOPTERA. 



As above defined this group contains but two species, which may 

 thus be distinguished : 



Black, slightly aeneous; thorax cordate, slightly wider than long, %'ery distinctly 

 narrower at base than apex, t>asal impressions unistriate ; elytra more than 

 one-half wider than the thorax, variegated with testaceous markings along 

 the margin ; legs testaceous. Length .10 -.14 inch afiiiie Say. 



Piceous or nearly black, the elytra sometimes tinged with brown, unicolorous; 

 thorax about one-half wider than long, subcordate, slightly narrower at 

 base than apex, basal impressions bistriate ; elytra slightly wider than the 

 thorax; legs rufo-tcstaceous. Length .10-. 13 inch. . . .iniiscicola n. sp. 



110. B. affiil*' Say. — Form slightly elongate, convex; color nearly black, 

 slightly ffineous, shining, the elytra with a small basal spot near the humerus, a 

 large triangular submarginal one about the middle, a smaller one about one-fourth 

 from apex and often the apex testaceous. Head scarcely narrower than the tho- 

 rax ; palpi rufo-testaceous, darker towards the tip ; antennje rather more than 

 one-half as long as the body, dark fuscous, the basal joints testaceous. Prothorax 

 cordate, slightly wider than long, very distinctly narrower at base than apex ; 

 apex truncate ; median line very fine, a])breviated in front : transver.se impres- 

 sions moderately distinct ; basal impressions small, moderately deep, uni.striate; 

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

 hind angles rectangular, very Snely carinate. Elytra more than one-half wider 

 than the thorax, oblong-oval, moderately deeply striate; strife very distinctly 

 punctate, the first and second only entire, the fifth represented by a groove at 

 tip; intervals slightly convex, the third with the first dorsal puncture about one- 

 third from base, the second about one-third from apex. Beneath black, shining. 

 Legs testaceous. Length 10. 14 inch ; 2.5-3.5 mm. 



A very pretty little species, easily recognizable front the others of 

 the genus. In color it resembles some forms of versicolor, but may 

 be at once distinguished by the arrangement of the frontal grooves. 

 In this it agrees with the next species, but is very distinct by the 

 characters given above, as well, as by its different facies. 



It occurs along the Atlantic coast from New England to Florida, 

 in the Middle States, Ohio, Michigan, the Lake Superior region, 

 Iowa, Missouri, Mississippi, Texas and Arizona. I have not known 

 of its occurrence on the Pacific coast. 



111. B. Ill iisci cola n. sp. — Form slightly elongate, con vex ; color varying from 

 nearly black to piceous. the elytra sometimes tinged with brown. Head as wide as 

 the thorax at apex; palpi rufo-piceous; antennse about one-half the length of 

 the body, fuscous, the basal j()ints rufous. Prothorax subcordate, about one-half 

 wider than long, narrower at base than apex; apex truncate; median line dis- 

 tinct, al)breviated before and behind : anterior transverse impression rather feeble, 

 the posterior distinct; basal impressions moderately deep, bistriate; sides with 

 the margin very narrowly reflexed, arcuate, slightly sinuate in front of the hind 

 angles, which are sub rectangular and finely carinate. Elytra slightly wider than 

 the thorax, oblong-oval, moderately finely striate, more finely towards the sides 

 and tip; strife punctate to behind the middle, the first and second only entire, 



