340 



green, in certain positions blue or purple, with very minute distant punc- 

 tures, a series of deep punctures with elevated centres near the suture, an 

 abbreviated series of similar punctures near the humeral angle, and a few- 

 scattered ones around the scutel : external margin Avith three white spots, 

 one of Avhich near the middle of the margin is large £.nd triangular, the 

 apex of the triangle pointing to the suture ; one very small and rounded 

 between the former and base of the elytron; and the third or posterior one 

 elongated longitudinally into an oblong oval shape, not quite attaining tbe 

 margin, and confluent behind Avith the terminal lunule. Pectus, postpectus, 

 and thighs green, with white decumbent hairs. 

 Variety a. Elytra purplish blue. 



b. Anterior spot of the elytron wanting. 



c. Anterior spot wanting, triangular [91] one reduced to a 

 transverse line, posterior one small, not reaching the ter- 

 minal lunule. 



d. Two anterior spots obsolete. 



e. All the spots wanting except the terminal lunule, which is 

 merely an abbreviated transverse line. 



f. Elytra immaculate. 



This species is evidently distinct from tlie very common C . sexguttala ; 

 a single glance at them when compared together will convince any one of 

 their specific ditference. The long slender mandibles of the denticulaia are 

 remarkable, those of the 6 guttata being one third shorter, more robust, 

 and more curved. The latter species has no hairs between the eyes, nor 

 beneath the pectus and postpectus, the elytra appear rough from the deep 

 confluent punctures with which its surface is impressed, and it is destitute 

 of the remarkable humeral and subsutural series of deep punctures. The 

 shape and disposition of the white spots are different in the two species, the 

 denticulata never having the supernumerary discal spot observable in a 

 variety of the sexguttata. 



This fine species was captured on the sands near Sweet Auburn in Cam- 

 bridge, in company with Mr. Say's splendid C. formosa} It was sent, 

 withthe next species, to Prof. Hentz, who has adopted the specific names 

 here (riven in a paper read before the Academy of Natural Sciences of 

 Philadelphia. His descriptions have not yet met my eye. 



C. hcemorrhoidalis. Brownish obscure; elytra with a humeral and termi- 

 nal lunule, an intermediate sigmoid band, and two dots behind the band 

 white; postpectus and thighs green, ventral segments sanguineous. 



Length nearly half an inch. 



Antennae green at base; head cupreous, with two green abbreviated lines 



' generosa, Dej. 



