Coleopterological Notices. 487 



cata, Acanthocinns princeps to spectabilis, PentaphijUus califor- 

 niciis to pallidus, and numerous other examples, where, in each 

 case, the representatives on the two sides of the continent are quite 

 certainly specifically distinct, but allied sufficiently to indicate proba- 

 ble divergence from a common ancestor in comparatively recent 

 geological time. 



HELOPS Fab. 



The species which have been associated under this name form, 

 in our fauna alone, a most difficult study. I will not attempt at 

 present to assign the following species to any of the numerous 

 genera which have been created at the expense of Helops, but will 

 simply indicate their relationship with described species. 



H. OTipennis n. sp. — Rather broadly oval, distinctly depressed above, 

 perijendicular at the sides of the elytra, black, with a feeble greenish-aneous 

 tinge, polished. Head rather wider than long, extremely coarsely, deeply, 

 not very densely but unevenly punctate ; eyes rather more prominent than 

 the sides before them ; epistoma subtruncate at apex : autennre wanting in 

 the type. Prothorax twice as wide as the head and fully three-fourths wider 

 than long ; apex but slightly narrower than the base, broadly, distinctly 

 emarginate between the slightly advanced but obtuse and distinctly rounded 

 angles ; base transversely, very evenly truncate ; basal angles right, not 

 rounded and distinctly prominent ; sides parallel, moderately arcuate, nearly 

 evenly so to within one-fifth the length of the base where they become strongly 

 convergent, very strongly sinuate just before the basal angles; disk trans- 

 versely, rather feebly convex, with a feeble and uneven median impressed line 

 which is coarsely, unevenly punctate, but on each side of which the disk is 

 smooth for a short distance, distinctly explanate near the sides, extremely 

 coarsely, deeply, very unevenly punctate, the punctures impressed and coa- 

 lescent. Elytra oval, a little more than three times as long as the prothorax 

 and, in the middle, fully two-fifths wider ; sides strongly, evenly arcuate ; 

 humeri completely obsolete, very broadly arcuate ; apex somewhat acutely 

 rounded ; disk with deep and widely impressed sulci which are coarsely and 

 approximately punctate, the punctures rounded ; intervals very strongly con- 

 vex, very finely, extremely sjjarsely and unevenly punctate, more or less 

 widely interrupted, more frequently and thoroughly so near the apex, especi- 

 ally the alternate intervals ; epipleurse very wide, extremely dilated toward 

 base where they are fully one-half as wide as the entire metasternum includ- 

 ing the episterna. Abdomen longer than the entire remainder of the body 

 including the head, transversely convex, polished, almost completely impuno- 

 tate, each segment with a large feeble oviform impression near the side ; meta- 

 sternum extremely short, between coxa and groove less than one-half as long 

 as the first ventral segment. Leys rather short and slender, finely, extremely 



