494 TRANSACTIONS OP THE 



ceous, thighs dark green. Abdomen, venter dark blue, segments 

 tipped with bronze, almost naked each side ; tail purple. 



Var. a. Elytra destitute of the intermediate band. 



This is the smallest of our species, being less than punctvlata, 

 and of the most sombre coloring ; the luuules and band hardly 

 relieved by a contrast with the general surface, as they are very 

 narrow. 



The preceding descriptions were drawn out from specimens in 

 my possession, the three last species, were caught by [425] 

 Mr. Thomas Nuttall on the Missouri, and now form a part of 

 his collection ; to him I am indebted for the permission to de- 

 scribe them. Specimens of those for which I have referred to 

 Melsheimer's Catalogue, were sent me by the Rev. John Melshei- 

 mer of Hanover, a zealous entomologist, and son of the author of 

 that work, who may justly be entitled the father of entomology 

 in this country. 



In order that the present paper may comprehend all the 

 known North American species of this genus, and thereby pre- 

 sent a complete Monograph, I subjoin from Fabricius, three de- 

 scriptions of species, which have not fallen under my notice ; 

 I therefore have taken the liberty to translate his description as 

 follows : — 



13. C. viOLACEA. — Bright blue polished ; labrum white. 

 Inhabits Carolina. 



Cabinet of Mr. Bosc. 



Desc. Of a medium size ; body bright blue, polished, covered 

 with elevated scabrous punctures; antennae dark brown at tip • 

 labium (labrum) and base of the mandibles above white. Syst. 

 Eleut. part 1, p. 232. 



Is not this referable to the genus Megacephala f 



14. C. ABDOMINALIS.— Black, labrum and lunule at the apex 

 of the elytra white ; abdomen rufous. 



Inhabits Carolina. 



Cabinet of Mr. Bosc. 



Bene. Smaller than C. gfrrannica ; head and thorax cylindri- 

 cal, black-cupreous, a little polished; labrum [426] white; ely- 

 tra black, an obscure line of impressed punctures at the suture, 



[Vol. I. 



