OF PHILADELPHIA. 217 



species by the colors of the head and thorax, which, in the pMla- 

 delphica, are always green, immaculate. Numerous specimens 

 were brought from Missouri by Mr. T. Nuttall. 



3. C. DissiMiLis. — Dark purple or greenish; antennae black) 

 beneath blued-black. [451] 



Inhabits Missouri. 



Body dark purple, violaceous or greenish, punctured ; punc- 

 tures profound, subequally distributed : head impressed between 

 the antennae : antennae and palpi black : thorax regularly convex ', 

 lateral edges regularly arquated ; scutel impunctured : elytra 

 destitute of striae : beneath blued-black : venter, punctures 



Length more than one-fifth of an inch. 



Varies in its colors. It is sometimes of a very dark purple 

 color, and sometimes of a bright green, more or less tinged, how- 

 ever, with violaceous, particularly about the suture. 



4. C. FORMOSA. — Green-gold, brilliant : antennae black ; suture 

 of the elytra purple; beneath violaceous. 



Inhabits Missouri. 



Body golden-green, brilliant, punctured : antennae and palpi 

 black : labrum purplish : thorax somewhat inequal ; edges bluish : 

 scutel purple, impunctured : elytra slightly and irregularly ru- 

 gose, punctured ; suture purple ; exterior edge blue : beneath 

 violaceous : tibia black. 



Length more than three-twentieths of an inch. 



A brilliant little insect. 



5. C. BASiLARis. — Green ; antennae black; basal joint rufous ; 

 thorax with a thickened margin. 



Inhabits Arkansa. 



Body green, very slightly glossed with violaceous, punctured : 

 vertex with an impressed line: [452] antennae black; basal 

 joint rufous: thorax indistinctly punctured ; punctures distant; 

 lateral margin much thickened : elytra with irregularly scattered 

 punctures : venter dusky, with a greenish gloss. 



Length less than one-fourth of an inch. 



I obtained this species near the Rocky Mountains. 



[Unknown to me. — Lec] 

 1824.] 



