90 NOKTII A>tKniCAN 



punctate, intermediate surface finely punctate, feebly depressed, hioadly an'l 

 rather strongly eniarginate anteriorly, bottom of the emargination having 

 two approximate strong triangular teeth ; remainder of the head iuipunctate ; 

 clypeal surface between the bases of the antennae very deeply excavated 

 under the overlianging porrected inter-antennal portions of the front, broadly 

 arcuate anteriorly, and bearing two elongate, oblique, approximate tubercu- 

 lations, which are directly under the two teeth of the frontal emargination : 

 labrum very transverse, transversely truncate anteriorly, strongly con- 

 stricted at base ; antennae stout, about as long as the head and pronotum 

 togetlier, basal joint moderate in size, very irregular in shape, being eniargi- 

 nate at tip and tuberculate beneath, joints two to four decreasing uniformly 

 in length, the latter quadrate, joints four to seven nearly equal, eighth very 

 slightly shorter, transverse, ninth very slightly larger, slightly transverse, 

 strongly cuneate, being wider externally, tenth abruptly much larger, sub- 

 globular, eleventh but very slightly wider than the tenth, longer than wide, 

 as long as the two preceding together, abruptly, obliquely, and finely acumi- 

 nate at tip. Prothorax very slightly longer than wide, widest at two-fifths 

 its length from tli(^ apex, where it is scarcidy as wide as the head ; sides at 

 this point very strongly arcuate, thence convergent and sinuate to the base ; 

 apex scarcely one-half as long as the greatest width, and nearly three-fourths 

 as long as the base; disk impunctate, strongly convex, having at one.fourth 

 the length from the base a small, very deep, nude, median puncture, from 

 which, extending anteriorly nearly to tlie apex, there is a narrow, very deep, 

 cleft-like, and conspicuous canaliculation ; at two-fifths the length from the 

 base there is on each side a large, circular, feebly impressed, spongy-pubes- 

 cent fovea, extended anteriorly throughout as a narrow, deep canaliculation ; 

 midway between the lateral and median foveae there is on each side a very 

 strong, erect, acute tootli continued anteriorly as a fine, feeble carina : be- 

 tween the median puncture and the basal margin there is a short, distinct, 

 connecting <;arina, and near the basal margin on each side two deeply im- 

 pressed punctures. Elytra at base equal in width to the base of the pro- 

 notum ; sides strongly divergent and arcuate throughout ; together very 

 broa<lly arcuate behind ; disk about as wide as long, convex, very feebly and 

 distantly punctulate ; sutural striae approximate, distinct; between each 

 and the suture a row of fine punctures ; each elytron has at base three punc- 

 tures, the middle are continued posteriorly through the basal third as a 

 broadly impressed channel ; humeri having a small oblique acute discal 

 tooth. Abdomen at base scarcely as wide as the elytra, equally long, rather 

 convex, impunctate ; first dorsal with two, very short, parallel stout basal 

 cusps. Legs slender, femora fusiform ; posterior tibiae long, arcuate, with a 

 slender terminal appendage ; tarsi very slender ; nietasternum with a strong 

 median canaliculation. Length 1.8 mm. 



AVashington, District of Columbia (Scliwarz). 



Ditlers from spretus Lit. by its larger size and tlie very deep 

 medial canaliculation of the prouotuui. 



B. vil'$>;illiac n. sp. — Form and t'olors nearly as in dtnticol/is; pubes- 

 cence more ciciise and conspicuous ; antennae slightly paler toward tip ; legs 

 more slender, especially the femora. 



