290 CURCULIONIDES. 



7. R. rectus. — Thorax with three abbreviated raised lines, 

 and dense diseoidal punctures; elytra with series of punctures. 



Inhabits United States. 



Body black, opake, covered with a dull cinereous coating ; 

 rostrum compressed, arquated, punctured at base, and with a di- 

 lated, impressed line at base above ; antennae piceous : thorax 

 with close set, diseoidal punctures ; three elevated lines or narrow 

 vittse, of which the intermediate one is abbreviated into an irre- 

 gular spot before the middle, or almost obliterated by the punc- 

 tures behind, the lateral ones are rectilinear, a little oblique and 

 obliterated before by [23] the punctures : scutel polished; elytra 

 with regular series of rather large punctures, 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. venatus the thorax is much more densely 

 punctured, and the lateral vittse are rectilinear. 



8. R. immunis. — Naked; thorax profoundly punctured, ex- 

 cepting on the middle and each side of the middle. 



Inhabits Louisiana. 



Body black, slightly polished, not covered by any deposite : 

 rostrum compressed, arquated, with minute punctures at base, 

 and a profound impressed line at base above : antennae piceous : 

 thorax with numerous profound punctures ; a broad impunctured. 

 longitudinal, hardly raised space each side of the middle, extend- 

 ing to the anterior and posterior margins, and a transverse im- 

 punctured 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 before the middle, are but little elevated, impunc- 

 tured; the thoracic punctures are profound and not dilated, 

 particularly a little group on the middle of the anterior margin, 

 and a more extensive double one behind the middle. 



9. R. placidus. — Thorax densely punctured ; elytra with 

 punctured striae ; feet dull rufous. 



Inhabits United States. 



