DESCRIPTION. 



Head black : labrum, clypeus on its anterior 

 margin and palpi at base, pale rufous : antennse 

 pale rufous, dusky at tip: thorax transverse, 

 nearly oval, rather short, rufous, immaculate: 

 elytra dark bluish-green, or somewhat violaceous ; 

 middle of the lateral edge obsoletely piceous: 

 postpectm and. feet deep black: venter testaceouso 



Variety, a. Elytra blue ; venter and thorax 

 sanguineous. 



OBSERVATIONS. 



This species was taken on the Mississippi, and 

 specimens also occurred near the Rocky Moun- 

 tains. It is as large as M. 4 — maculatm, Fabr., 

 and larger than M. thoracicus, Fabr., which it 

 much resembles. The variety was sent me from 

 Massachusetts by Mr. Charles Pickering. 



The right figure of the plate. 



PLATE 48. 



