C22] 



at the tip ; thorax particularly covered with the crust, which is punctured lea- 

 ving only three elevated, impunctured vittae, of which the intermediate one is 

 wider before the middle and the lateral ones behind the middle: elytra with 

 slender, acute striae, in which are very small punctures ; interstitial lines 

 equal, regular, a little convex. 

 Length nearly eleven twentieths of an inch. 



4- R. iruncatus, Thorax with three vittae ; elytra with the alternate intersti- 

 tial lines more obvious. 

 Inhab. Missouri. 



Body black, partially covered with a dirty cinereous crust ; punctured .• ros- 

 trum arquated, compressed, with an elongated groove at base above, attenuated 

 at tip : ihorax with three elevated, punctured vittae, of which the intermediate 

 one is dilated suboval before the middle, and the lateral ones have an obvious 

 branch extending to the posterior angles .• elytra almost truncate behind ; 

 striae numerous; interstitial lines slightly punctured, the alternate ones more 

 obvious ; two or three striae between the interstitial lines. 



Length half an inch. 



Much like R. pertinax, but the broader thoracic vittae, the more numer- 

 ous striae, unequal interstitial lines and almost truncated elytra, distinguish it. 



5. R. cicatricosus, Thorax with three vittae / elytra with an elevated line f» 

 obsolete dilated indentations. 

 Inhab. Louisiana. 



Body black, partially covered with a dirty cinerous crust or pellicle ; rostrum 

 arquated, compressed, with a slight groove at base above ; thorax with three- 

 elevated, dilated, irregular, impunctured vittae, the lateral ones have an obvi- 

 ous branch extending to the posterior angles ." elytra v^'ilh. numerous striae, a 

 more obious, elevated, subsutural, impunctured, interstitial line; numerous dila- 

 Sed, obsolete dots or slight undulations. 



Length nearly nine twentieths of an inch. 



Resembles the preceding as respects the number of the striae of the elytra, 

 but their surface is rendered a little irregular by indented dots or undulations 

 which are obsolete ; the thoracic vittae are a little truncated at tip. 



6. R. venatus, Thorax trilineate, and with discoidal punctures ; elytra with 

 capillary striae ; surface a little inequal. 

 Inhab. U. S. 



Body black opake, more or less, and particularly the thorax, covered with a 

 dull cinereous deposite ; rostrum with discoidal punctures at base ; compressed, 

 a little arquated ; a dilated impressed line at base above ; thoraxwith dicoidal, 

 equal punctures ; trilineate, the intermediate line slender, the lateral ones un- 

 dulated, a little broader, punctured ; elytra with distinct, acute striae, punct- 

 ures large but not profound, obsolete, excepting each side and at base; inler- 

 stitiallines alternately and very slightly more prominent; surface slightly iae- 

 qual. 



Length over three tenths of an inch. 



Smaller than the preceding species, and the thoracic elevated lines are much 

 more slender. 



7. R. rectus. Thorax with three abbreviated raised lines, and deoie discoidal 

 punctures ; elytra with series of punctures. 

 Inhab. U. S. 



Body black, opake, covered with a dull cineieous coating ; rostrum compres- 

 sed, arquated, punctured at base, and with a dilated, impressed line at base 

 above ; antennae piceous .- ihorax v/iih close set, discoidal punctures ; three ele- 

 vated lines or narrow vittae, of which the intermediate one is abbreviated into 

 an irregular spot before the middle, or almost obliterated by the punctures be- 

 hind, the lateral ones are rectilinear, a little oblique aod obliterated before by 



