OP PHILADELPHIA. 91 



4. C. PULCHRA. — Elytra red-cupreous, highly polished, exte- 

 rior margiu purple, with two white dots. 



Inhabits Missouri Territory. 



Body greenish-purpurescent : vertex with a large cupreous 

 spot: front very hairy: antennae, terminal joints black: labrum 

 short, wide, hardly longer in the middle than each side; slightly 

 3-toothed : mandibles white ; teeth, extremity and inferior sur- 

 face, black : thorax, disk with a larger double purplish-cupreous 

 spot : elytra reddish-cupreous very brilliant ; exterior margin 

 purplish-blue, with a humeral white dot and an angular white 

 dot near the middle ; punctures numerous, larger, and more pro- 

 found towards the base, obsolete at tip : pectus hairy each side ; 

 postpectus and feet hairy. 



Var. a. Spot upon the humerus, none. 



Length less than seven-tenths of an inch. 



A remarkably splendid insect, and is a large species. It occurs 

 in the country bordering the Platte and Arkansa rivers near the 

 mountains. [ 143 ] 



5. C. OBSOLETA. — Black ; labrum and point on the elytra 

 white ; venter purple-black. 



Inhabits Missouri Territory. 



Body deep black, opaque : cheeks tinged with purplish, 

 polished : antennae four basal joints dark purplish: labrum and 

 exterior base of the mandibles white : thorax with two transverse 

 indented lines connected by a longitudinal one ; lateral margin 

 with cinereous hair: elytra with minute profound punctures to- 

 wards the base, impunctured towards the tip ; a transverse white 

 abbreviated line on the middle of the submargin, and an obsolete 

 apical dusky-yellowish dot : venter tinged with purplish. 



Length four-fifths of an inch. 



Var. a. Black, immaculate. 



This large and fine species we observed to be not uncommon 

 on the banks of the Arkansa river, near the mountains. It 

 seems to be closely related to C. fristis Fab. The elytra exhibit 

 in some lights a silky appearance. 



BR AC MINUS Weber, Latr. 



B. CYAXiPENNis. — Testaceous; elytra blackish-blue; venter 

 dark reddish-brown. 



Length near seven-twentieths of an inch. 

 1823.] 



