Mr. H. W. Bates on the Endomychidao of the Amazon Valley. 163 



§ B. Elytra moderately convex, the whole of the lateral margins seen when 



viewed from above. 

 a. Elytra at the base as broad or broader than in the middle (at least in 



the $ ), obtuse heart-shaped. 



3. Corynomalus circumcinctus, n. sp. 



C. rufus, antennis runs, articulis nonnullis ante clavam fuscis, ipsa clava 

 nigra ; elytris punctatis, interstitiis sequalibus subtiliter punctatis, 

 nitidis, nigro-cyaneis, margine ornni et regione scutellari testaceo-rufis. 

 Long. lin. 3(c? ?). 



Pale red. Head rather thickly punctured, shining. Antenna? 

 slender, third joint shorter than the two following united, the seventh 

 and eighth joints fuscous, the club black. Thorax short, the sides very 

 slightly bowed outwards froni the base to the apex, being broadest at 

 two-thirds the length ; finely punctured, and shining rather brightly 

 with a silky gloss. Scutellum plane, pale red. Elytra evenly punc- 

 tured, the interstices plane, and covered with very minute punctures ; 

 dark steel-blue, with the outer and basal margins and the region of the 

 scutellum testaceous red. Body beneath, under-margins of the elytra, 

 and legs pale red. 



This species I found only at Obydos, on the Guiana side of the 

 Lower Amazon ; it was abundant on the branches of felled trees there 

 in March 1859 ; but I have now before me only three examples, 

 namely two males and one female. At first sight it might be taken 

 for the C. marginatus, Fab., Gerst., which is peculiar to Guiana, 

 especially as it is found on the Guiana side of the Amazons ; but it 

 differs from that species greatly in the punctuation of the elytra and 

 in the want of pale sutural margins. The true C. marginatus I did 

 not meet with at all on the Amazons. In the punctuation of the 

 elytra our species resembles C. discoideus, and it might be said to 

 represent that species on the Guiana side of the Amazons, as C. dis- 

 coideus does not occur in company with it, although common in 

 many other localities on the opposite side of the river. 



4. C. discoideus, Fab., Gerstaecker, Mon. der Endom. p. 151. 



I have before me one male and six females of a form which 

 agrees extremely well with Gerstaecker's description of this species ; 

 six of the specimens were taken at Ega, and one at Santarem. 

 Gerstaecker's examples came from Bahia; but he had examined 

 others supposed to have been found in Columbia and near Rio Janeiro. 

 It appears that he did not obtain from these various localities any wider 

 deviations from the normal form than those described in his work as 

 varieties a and b; on the Amazons, however, several forms more 



