182 AMERICAN COLEOPTERA. 



moderately incrassate, scarcely serrate, the penultimate joints about 

 one-half wider than long. Eyes rather large, the emargination extend- 

 ing beyond the middle, separated by a distance evidently less than 

 their own width. Head finely closely punctate, front feebly obtusely 

 carinate. Prothorax only about one-fourth wider than long, sides 

 broadly arcuately convergent, faintly sinuate near the base, surface 

 coarsely rather closely punctate. Scutellum slightly transverse, more 

 densely pubescent. Elytra slightly longer than wide, sides moderately 

 arcuate, humeral umbone not prominent ; striae fine, scarcely punc- 

 tured ; intervals flat, finely subrugosely punctate. Pygidium vertical, 

 convex, tip inflexed, punctuation somewhat coarse but vague. Hind 

 femora rather stout, armed with an acute tooth and two rather strong 

 denticles closely approximate to the tooth. Apical spur of hind tibia 

 short. Length, 1.6-1.65 mm. ; width, 1 mm. 



Chiricahua Mountains, Arizona. Two examples, probably 

 both males, collected and given me by Mr. V. L. Clemence. 



The present species is closely related to schrankicz, and may 

 possibly not be distinct. The latter spcies is from Missouri, 

 is considerably larger (2.5 mm. according to Horn), and has 

 all the femora black. A specimen from Williams, Arizona, 

 in my collection is probably properly placed with the present 

 species although the antennae are pale at base only. 

 B. perforatus Horn, 



As in distinguendus the antenna? of the male are more than 

 ordinarily long and stout, the fourth joint much longer 

 and wider than the third. The male in perforatus has the 

 first ventral concave at middle and with a well-marked lobe 

 bearing longer hairs at the middle of the posterior margin. 

 In the female the first ventral suture is posteriorly arcuate 

 at middle. A similar male character exists only in lobahis 

 so far as I know. The coarse serial punctures of the elytral 

 intervals, so conspicuous in perforates, and only a little less 

 so in distinguendus, ally these two species and distinguish 

 them from all neighboring forms. 



B. lobatus n. sp. 



Elongate ovate, black, uniformly moderately densely cinereous pubes- 

 cent, very similar in nearly all respects to fraterculus and aureolus, 

 and only separable with certainty by the abdominal sexual characters 

 of the male. In this sex the flattened area of the first ventral is dis- 

 tinctly longitudinally concave, entirely devoid of any basal fovea or 

 small densely punctured area (which is characteristic of fraterculus 

 and aureolus) , and with the apex produced in a thin slightly deflexed 

 laminiform lobe which is narrowly truncate at tip. The antennas are 

 long and subserrate, nearly attaining the middle of the elytra, the first 



