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384 Say^s Descriptions of 



Body black, punctured : head ferruginous ; region of 

 the stemmata, black : antenn^E black, first and second and 

 half of the third joints ferruginous : thorax with a broad 

 ferruginous margin^ including the scutel, and with more 

 or less of ferruginous in the middle ; anterior margin with 

 a slender yellow line interrupting the ferruginous margin: 

 ivings black-violaceous : feet yellowish : thighs dusky at 

 base : tergum^ first segment impunctured^ on the poste- 

 rior margin a yellow band abruptly dilated each side ; 

 second segment slightly punctured at base, posterior 

 indented, with large punctures, and dull ferruginous ; 

 remaining segments punctured, 



Var. a. Behind the scutel a transverse^ yellow, ab- 

 breviated line. ' 



Var. ^. Posterior margins of the terminal segments 

 of the tergum, obsoletely ferruginous. 



Var, X. The ferruginous color predominates having 

 but a small portion of black on the thorax ; the tergum is 

 ferruginous with only a line of black on the first segment, 

 and a triangle of black at base of the second segment ; 

 but the yellow band on the first segment is still visible 

 though less obvious. 



Length over four fifths of an inch. 



Not a common insect. 



2. R. 5-fascidtumy Nob. (Pterochilus, Appendix to 

 Long^s second Expedition). I am not sure of the generic 

 place of my specimens as they have lost their trophi* 



3. R- crypticum^ Nob. (Od^nerus, Western Quarterly 

 Reporter). 



4. R. annulatum, Nob. (Odynerus, Appendix to 

 Long's second Expedition). 



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