32 [February, 



II. Palpi slender. 

 , 1. Body elongate. 



* Elytra irregularly punctured. 



Sides of the thorax thickened. E. 



Sides of the thorax not thickened. F. 



** Elytra with regular striae of punctures. G. 



2. Body rounded 



*** Elytra with regular striag of punctures. H. 



**** Elytra irregularly punctured. 



Tibias excavated externally and dilated at tip. I. 



Tibiae excavated externally, hardly dilated at tip. K. 



Group K, does not appear in the subsequent pages, as I have seen no American 

 specimens of C. adonidis, the species on which it is founded ; although Kirby 

 states that specimens of it were obtained in high northern latitudes. 



A. 



1. C. scalaris. Oval, greenish blue, elytra punctate, yellowish white 

 spotted with blue, suture with a broad metallic black stripe branched in three 

 or four places, humerus with a large lunate spot; under surface bronzed black, 

 antennas and legs ferruginous. Tab. 1, fig. 2. 



Length -3240. 



Lee. Ann. Lye. 1, 173. Harr. Ins. 117. 



C. phUadelphica'l Kirby, Faun. Bor. Am. 210. 



Locality. Middle States, Lake Superior and Nebraska. 



Oval, rather narrower than usual, greenish blue, sometimes dark bronze ; 

 thorax with scattered punctures at the sides, elytra punctate, yellowish white, 

 and very brilliant silvery when living ; suture with a broad metallic stripe general- 

 ly black, sometimes bronze and dark blue. This insect is closely allied to C. 

 philadelphica of Linn., the difference consists in the suture being marked 

 with a broad black stripe, with which the spots are connected so as to form 

 branches ; in C philadelphica the suture is black, straight and narrow, 

 separated from a narrow subsutural black vitta by a narrow yellow line. There 

 is considerable variety in the color and size of the spots of these insects. 



2. C. serpentina. Oval, greenish blue, elytra pale gold, with the suture 

 and several large sinuous dark blue spots more or less confluent ; margin black, 

 antennae black, red towards the base ; legs dark red, under surface bluish black. 

 Tab. 1, fig. 3. 



Length. -42. 



Five specimens collected by J. D. Clark, Esq., at San Antonio, Texas. 



Body oval, moderately convex ; head with a triangular impression between the 

 eyes, thorax coarsely punctured at the sides, scutellum bluish green, elytra pale 

 gold, suture and confluent stripe blue, the latter not reaching the base, with 

 about ten dark blue spots, wings brilliant red ; under surface very dark blue, 

 almost black ; antennae hairy at the tip. 



I have adopted the name used in Dr. Le Conte's Cabinet. In dried specimens 

 the golden tint of the elytra fades, and the color becomes yellowish white. 



3. C. dislocata. Oval, bluish green, elytra pale ferruginous, with subsutu- 

 ral vitta and several sinuous black spots more or less confluent, antennae black- 

 ish, red at the base, legs and under surface black. Tab. 1, fig. 4. 



Length. "35. 



Three specimens collected by J. D. Clark, Esq., San Antonio, Texas. 

 Body oval, moderately convex, head moderately punctured ; thorax strongly 

 punctured at the sides. 



4. C. tortuosa. Oval, ferruginous ; elytra yellow with several black spots, 

 suture and a subsutural vittac dark ferruginous, the latter confluent near the tip, 

 antennae, legs and under surface ferruginous. Tab. l,j fig. 5. 



Lengtla. -25. 



Two specimens collected by J. D. Clark, Esq., San Antonio, Texas. 



