OBSERVATION. 



This fine species is an inhabitant of the Arkan- 

 saw region, near the Rocky Mountains, where 

 I captured two specimens. In magnitude it 

 exceeds any other North American species yet 

 known. The second joint of the antennse in 

 the male is dilated and irregular. 



The lowest figure of the plate. 



MALACHIUS TRICOLOR, 



SPECIFIC CHARACTER. 



Hcad^ postpectus, and feet black; labrum 

 and thorax rufous ; abdomen rufo-testaceous. 



SYNONYM. 



M. TRICOLOR. NoUs. Journ^ Jimd Nat. Sd- 

 enceSy vol. iii. p, 182. 



PLATE 48. 



