of the Amazon Valley. 297 



testaceo-alba antice nigro-marginata^ pone medium fascia 

 testaceo-alba recta, et prope apicem fascia obscura fusca, 

 spatio inter fascias primam et secundam nigro, inter 

 hanc et fasciam tertiam fulvo-brunneo, spatio apicali tes- 

 taceo-albo ; antennis femoribusque fulvo-testaceis, his 

 nigro-maculatis, femoribus posticis incrassatis, quasi 

 clavatis, apice bidentatis ; antennis articulo 3to carinato 

 et bisulcato ; tibiis posticis vix perspicue carinatis. 



Long. 4^ lin. 



Hah. — River Tapajos. 



14. Octoplon cliar'de, n. sp. 



Elongatum, lineare, opacum ; capite testaceo-rufo, ver- 

 tice nigro ; thorace valde inaequali, tuberculoso, disco 

 tuberculis minoribus setiferis sparsis, testaceo-rufo, seri- 

 ceo-tomentoso, margine antico et disco nigris; elytris 

 sordide testaceo-albis, passim punctulatis, punctisque 

 setiferis asperatis, plaga magna scutellari alteraque 

 minore prope apicem castaneis, pone medium fascia obliqua 

 et paulo infra macula communi suturali nigris ; antennis 

 pallide rufescentibus, articulis 3-5 forte sulcatis et cari- 

 natis; femoribus posticis paulo incrassatis, bidentatis, 

 tibiis haud perspicue carinatis. 



Long. 5 lin. ? . 



Hah. — River Tapajos. 



Genus Ibidion. 



Serville, Ann. Soc. Ent. Fr. 1834, p. 103; Lacord. 

 Gen. viii. 331. 



This genus is here restricted, following Lacordaire, to 

 those species having the third antennal joint and posterior 

 tibiae carinate, and the hinder thighs distinctly or ab- 

 ruptly clavate and simple at their apices. 



1. Ihidion monostigma, n. sp. 



Elongatum, elytris postice gradatim attenuatis, thorace 

 antice constricto ; castaneo-rufum, nitidum ; thorace 

 postice punctulato et sparsim tomentoso, medio dorsi 



