of the Amazon Valley. 
297 
testaceo-alba anfcice 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 3 to carinato 
et bisulcato ; tibiis posticis vix perspicue carinatis. 
Long. 4| lin. 
Hah . — Eiver Tapajos. 
14. Octoplon charile, 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 baud 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 
