BY THOMAS G. SLOANB. 371 



nn. Posterior tibia light, pro- 

 thorax with three marginal 



punctures on each side ft tumidipes, SI. 



<v. Anterior angles of prothorax very 



little advanced (not prominent) C. iridescent, SI. 



DD. Prosternum with intercoxal part 

 obliquely rounded at base, the 

 middle forming a subtuberculiform 

 prominence. (Prothorax and elytra 



with cupreous margins) ('. lepidum, SI. 



AA. Head with two supraorbital punctures, 

 prothorax with three marginal punctures 

 on each side. (Frontal sulci strongly 

 divergent backwards). 



o. Posterior tibia thick, incrassate ( C ' ° dew . ahni > Cast. 



I ft xpeeiosttm, SI. 

 oo. Posterior tibiae slender. 



'ft elegans, Macl. 



p. Prothorax with marginal channel and 

 reflexed border wide 



ft splendens, Cast. 

 ( '. nijipes, Macl. 

 ft cognation, SI. 

 ft optimum, SI. 

 pp. Prothorax with marginal channel 



and reflexed border narrow ft distinctum, Macl. 



I offer the following notes on some species of the C. smaragdu- 

 lum Group, including the species I have omitted from the table 

 given above : — 



C. porphyreum, Bates, is evidently closely allied to C. cupreo- 

 marginatum, Blkb., and C. opulens, SI, but should be readily 

 distinguishable from them by the green margins of the prothorax 

 and elytra. It is described as having the prothorax with " the 

 hind margin not lobed and distinctly trisinuate." 



C. smaragdulum, Westw.,must present an affinity to C. virescens 

 81. Its shining green colour distinguishes it from allied described 

 species excepting C. virescens; however, from Westvvood's figure 

 the humeral angles of the elytra seem more rounded with the 

 border less erect than in C. virescens. I believe, judging from 

 Westwood's figure, that G. smaragdidum resembles C. habile, SI., 

 in facies. 



