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the punctures : tcutel polished : elytra with regular eeriea'of rather large punc- 

 tures, the four interstitial lines next the suture, on each, more elevated than 

 those of the middle. 

 Length about three tenths of an inch. 



In comparison with R. venaius, the thorax is much more densely punctured, 

 and the lateral vittae are rectilinear. 



8. R.immunis, "Naked ; thorax profoundly punctured, excepting on the middia 

 and each side of the middle. 



Inhab. Louisiana. 



Body black, slightly polished, not covered by any deposite : rostrum compres- 

 sed, arquated, with minute punctures at base, and a profound impressed line 

 at base above : antennae piceous ; thorax with numerous profound punctu- 

 res; a broad impunctured, longitudinal, hardly raised space each side of the mid* 

 die, extending to the anterior and posterior margins, and a transverse impunc- 

 lured space before the middle : scutel polished : elytra with regular, somewhat 

 double series of punctures ; interstitial lines regular, convex, alternately a little 

 wider, and wider than the diameter of the punctures. 



Length over three tenths of an inch. 



The raised surfaces of the thorax on each side of the middle, and a little be- 

 fore the middle, are but little elevated, impunctured ; the thoracic punctures 

 are profound and not dilated, particularly a little group on the middle of the an- 

 terior margin, and a more extensive double one behind the middle. 



9. R. placidus, Thorax densely punctured ; elytra with punctured striae ; feet 

 dull rufous. 



Inhab. U.S. 



Body black, punctured: rostrum arquated, compressed, piceous towards the 

 base; with an impressed, punctured line ; antennae piceous : thorax with dense 

 punctures, destitute ofobvious elevations : scutel concave, polished : elytra with 

 series of punctures rather wider or as wide as the interstitial lines, which also 

 have a series of small punctures ; tip dull piceous : feet rufous, with black incis- 

 ures. 



Length about three tenths of an inch. 



In general shape it resembles R. immunis, N. but the thorax has not very ob- 

 vious elevations and is more generally punctured ; the punctures of the eiy- 

 tral series are larger & the interstitial lines have a series of small punctures ; 

 the feet also are rufous. 



10. R. inaoqualis. Thorax with numerous discoidal punctures ; elytra with 

 the punctures in the series remote. 



Inhab. U. S. 



Body black, more or less covered with a dirty brown pigment or crust, pun- 

 ctured ; ros/rwjn, moderate, compressed, arquated, with an impressed line at 

 base ; thorax with discoidal punctures and from one to three'slight elevations.- 

 tlytra with obvious striae, in which are remote' punctures ; interstitial lines 

 with oblong, longitudinal punctures ; sutural line with a series of small close 

 set punctures. 



Length nearly one fourth of an inch. 



The elytral punctures are remote in the striae, and those of the interstitial 

 Sines are much elongated. 



11. R. compressirostris, Nob. (Calandra) Journ. Acad. Nat. Sc. 1823. Amer. 

 Ent. Vol. l.pl.9, 



Germar Coleopt. Sp. Nov. 1824, 



