OBSERVATIONS. 



This is somewhat smaller than the stenos- 

 tomus, from which it is very distinct, and is 

 the most hrilliant species we have. I have not 

 yet met with it in the Atlantic states. The 

 first specimen was obtained in Missouri, and I 

 caught another in the North- Western Territory, 

 when travelling over that region with Major 

 Long's party. 



The right figure of the plate. 



SCAPHINOTUS. 



GENERIC CHARACTER. 



Head narrower than the thorax; external 

 maxillary, and labial palpi, with the last joint 

 dilated, compressed, securiform; labrum elon- 

 gated, profoundly emarginate ; labium very large, 

 profoundly emarginate, not wider at base than 

 at tip; mandibles elongated, narrow, bidentate 

 near the tip; thorax with the lateral margins 

 reflected, posterior angles extended ; elytra entire, 



PLATE 45. 



