296 
Mr. H. W. Bates on Ceramhycidat 
11. Octoplon rugicoUej n. sp. 
Lineare^ breviter setosum, nitidum ; thorace medio 
elevato et grosse transversim rugato_, rufescente,, antice 
cum capite obscuriori, lateribus sericeo-tomentoso ; 
elytris apice unispinosis^ angulo suturali producto^ 
supra punctis setiferis sparsis, versus basin aspere tuber- 
cuiatis^ rufescentibus^ tertia parte apicali nigra, macula 
indistincta versus basin alteraque recta transversa suturali 
communi testaceo-fulvis ; pedibus rufis, femoribus incras- 
satis, apice bidentatis. 
Long. 4| lin. $ . 
Hah. — River Tapajos. 
12. Octoplon thoracicum. 
Ihidion thoracicum, White, Cat. Longic. Brit. Mus. 
p. 228. 
Cylindricum, opacum, sparse setosum, pallide ochreum ; 
thorace opaco, nigro, annulo magno per totam superficiem 
submarginalem rufo-testaceo et aureo-tomentoso ; elytris 
punctis setiferis asperatis, pallidis, fasciis angustis quinque 
pallide fuscis, duabus primis prope suturam conjunctis, 
spatio basali et inter fascias 4tam et 5tam pedibusque 
rufescentibus. 
Long. 4 J lin. 
The third antennal joint in the S is gradually thick- 
ened, and is carinate, without grooves. The femora are 
much thickened and almost clavate, at the apices dis- 
tinctly bidentate. 
Hah. — River Tapajos. 
13. Octoplon Rutha. 
Ihidion Rutha, White, Cat. Longic. Brit. Mus. p. 227. 
Cylindricum, capite rufo-testaceo, cinereo-tomento- 
so; thorace inaequali, nigro, opaco, cinereo-tomentoso, 
punctis cinereis consperso, postice testaceo-rufo ; elytris 
unispinosis, supra nitidis, sparsim longe fulvo-setosis, 
punctis setiferis asperatis, basi fulvo-brunneis, deinde 
fascia perobliqua a scutello ad medium marginis extensa 
