AMERICAN COLEOPTERA. 471 



KIII\0:VCUS Sch. 



Beak stout, widened towards tlie apex, scrobes oblique, deep; an- 

 tenna} with 7-jointed t'unicle, clava elliptic, acuminate. Kves large, 

 rounded, more or less convex, witiiout distinct supra-(U'bital ridges; 

 scutel not visible ; ])r()sternum long in front of the coxae, deeply 

 emarginate, with distinct ante-coxal ridges ; mesosternum oblique, 

 metasternum a little shorter than the first ventral segment ; second 

 ventral segment as long, or longer than the two following segments 

 together, the third segment not narrowed on the sides, fully attain- 

 ing the lateral margin ; anterior coxie conical, i)rominent and rather 

 widely separated, middle coxie globular, separated about tw'ice the 

 distance of the anterior coxse, their cavities formed equally by the 

 meso- and metasternum. Legs rather slender, third tarsal joint 

 l)ilobed, claws armed with a long tooth. 



The species of this genus, although varying from a broadly oval 

 to an elongate form, present a habitus peculiarly their own. The 

 expression " without distinct orbital ridges," as used in the analytical 

 table and again in the above description of the genus requires some 

 explanation, inasmuch as such a ridge, ill-defined as it is, exists in 

 most of the species examined by me. Dr. LeConte's statement, " no 

 trace of supra-orbital ridge," is therefore erroneous. In the Euro- 

 pean species, R. fopiarius, this ridge is quite prominent and the front 

 concave, as much so as in certain Pelenomi ; it is entirely absent 

 only in R. /oiuju/us Lee. and its European congener, R. perpeudicu- 

 /((rls. In all the anterior coxiB are much more widely separated 

 than in Pelenomn-^ or Mecopeltus. In all the species there exists a 

 conspicuous scutellar spot of white or pale scales, and the anterior 

 thoracic margin is entire. The ai)ical armature of the tibiiu in the 

 male difiers in each of the three species. 



I have no additions to make to the three species heretofore known 

 and which may be distinguished as follows : 



Eyes as widely sepaiated above as the width of the beak, the latter longer than 

 the liead : form stout. 



Larger, elytra not tul)ercnlate occitloiltalis. 



Smaller, elytra tiibcri'ulate p^rrliopiiM. 



Eyes encroaching upon the front, beak sliorter than the head ; form ohlong. 



lOllj^lllllS. 



R. occidonfalis n. sp. — Oval, robust. Itlack, antennai and legs piceous: 

 above thinly clothed with coarse grayish pubescence; beneath densely clothed 

 with dirty gray scales. Beak a little longer than tlie head and separated from it 

 by a curved impression in front of the eyes, widened at its apical third, distinctly 



TRANS. AM. ENT. SOC. XXIII. DECEMBER, 1896. 



