Amazonian Prionides. 45 



Genus Ialyssus. 

 J. Thomson, Syst. Ceramb. p. 296, 



1. Ialyssus tuherculatus. 

 Oliv. Ent. QQ, p. 20, pi. 6, f. 22. 



I. oblongus, fusco-castaneus, elytris (basi scabrosa ex- 

 cepta) rufo-ochraceis, Isevibus, opacis, angulis sutu- 

 ralibus spinosis ; antennarum articulis primo et 

 tertio longitudine sequalibus. 



c?. Thorax subtiliter creberrime punctato-rugosus, 

 opacus, disco utrinque plaga triangiilari lineisque 

 duabus, et basi linea transversali, elevato-scabrosis, 

 nitidis. 



? . Thorax omnino scabrosus. 

 Long. 2 unc 4 lin. 



I found one example only, a male, of this rare species ; 

 at Ega, washed up on a sandy beach, after a storm, on 

 the river Teffe, 



Genus Mallodonhoplus. 



J. Thomson, Classif. des Ceramb. p. 320; Lacord. Genera, 

 viii. p. 117. 



Distinguished from the genus Mallodon by the femora 

 and tibiee, at least of the anterior legs, being armed with 

 rows of short denticulationsj and by the scabrous punc- 

 tuation of the thorax. The portion of Lacordaire's 

 definition relating to the mandibles, will have to be 

 modified, to include the following species, which is 

 undoubtedly congeneric with the type species, M. 

 nohilis. 



1. Mallodonhoplus crassidens, n. sp. 



M. oblongus, paullulum convexus, piceo-niger, capite 

 grossissime punctato, labro antice ligulaque fulvo- 

 hirsutis, mandibulis capite brevioribus ( $ ) extus 

 a basi valde rotundato-dilatatis vel tumidis, apice 

 acutissimis, supra scabrosis, intus concavis vix hir- 

 sutis et margine interiori medio dilatato quadri- 

 dentato ; antennis dimidium corporis superantibus, 



