Amazonian Prionides. 
45 
Genus Ialyssus. 
J. Thomson^ Syst. Ceramb. p. 296. 
1. Ialyssus tuherculatus. 
Oliv. Ent. 66j 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 prime et 
tertio longitudine eequalibus. 
d'. Thorax subtiliter creberrime punctato-rugosus, 
opacus, disco utrinque plaga triangulari lineisque 
duabus^ et basi linea transversali, elevato-scabrosis, 
nitidis. 
9 . 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 tibiae, at least of the anterior legs, being armed with 
rows of short denticulations, 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. 
nobilis. 
1. Mallodonhoiolus 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. 
