1873.] 11" [Horn. 



also variable. The fifth segment of the abdomen is always deeply 

 notched, the sides of the notch being straight and slightly reflexed, the 

 bottom either truncate (pugnax), broadly lobed (styliferus), unidentate 

 (peregrinus group), or bidentate (striatus group). Beyond the fifth seg- 

 ment the sixth is usually plainly visible, especially in the males. Between 

 the hind coxse the first segment is distinctly carinate, the carina extend- 

 ing frequently the entire length of the segment. In many species the 

 males have the second, third and fourth segments elevated at middle, 

 sometimes forming merely an elevated line, at others a triangular carina. 

 The species in our fauna may be divided into three sub-genera, the last 

 of which might with propriety be received as distinct. 

 Epistoma prolonged, eyes large, prominent. 



Elytra at apex, spinous or emarginate Enoplurus. 



Elytra not spinous, rarely acutely prolonged Berosus. 



Epistoma short, broadly rounded, eyes not prominent. 



Form very convex, strongly compressed at sides Volvulus. 



The species of the sub-genus Enoplurus are : 



Elytra unispinous at apex, spine not sutural punctatissimvs. 



Elytra bispiuous at apex. 



Fifth abdominal segment bidentate at middle miles. 



Fifth segment truncate at middle pugnax. 



Elytra emarginate at apex. 

 Fifth segment bidentate ; male abdomen not carinate 



beneath emarginatus. 



B. punctatissimus, Lee. Ann. Lye. V, p. 211 ; Proc. Acad. 1855, p. 363. 



Head black, surface with brilliant cupreous metallic lustre, coarsely 

 and densely punctured, vertex finely carinate. Thorax coarsely punc- 

 tured, testaceous, a median elongate oval space with cupreous lustre, 

 divided longitudinally and an irregular small patch on each side. Elytra 

 striate, more deeply toward the sides and apex, strise coarsely punctured, 

 interspaces densely punctulate. Bod y beneath black, opaque. Legs testa- 

 ceous, femora black, opaque and pubescent at base. Length .24-.30 

 inch ; G-7.5 mm. 



3faJe. Second and third joints of anterior tarsi more dilated, third seg- 

 ment of abdomen with feebly elevated line, fourth with moderate trian- 

 gular crest, fifth with strong crest, first segment feebly carinate between 

 the cox;e. 



The mesosternal crest is not very prominent and has a small tooth at 

 middle. The mesosternum in front of hind coxae is carinate at middle 

 and on each side dentate. The color of the upper surface is testaceous, 

 the elytra irregularly maculate with fu-cous. Elytra at apex unispinous. 

 spine not sutural. California and Arizona. 



B. miles, Lee. Proc. Acad. 1855. p. 363. 



Head with aeneous tinge, coarsely not densely punctured, vertex finely 

 carinate. Thorax minutely alutaceous, sparsely punctured. Elytra 



