292 Mr. H. W. Bates on Ceramhycidce 



side, and tho dilatation of the cheeks behind the eyes, offers 

 all the other characters of the IJndUna'. The thorax 

 is more narrowed anteriorly than in most other species, 

 and is constricted there, as well as near the hind margin. 

 The antenniferous tubercles are obtusa, but the specimen 

 is a ? . 



Hah. — Tapajos. 



4. Octoplon unocvlum, n. sp. 



Cylindricum, longe pilosum, nigrum, nitidum ; thorace 

 flavo-griseo-pubescente, tuberculo discoidali nigro ni- 

 tido ; ely tris postice valde convexis, ante medium fascia 

 interrupta alba, diraidio apicali flavo-griseo-pubescente, 

 antice albo-marginato, sparse punctatis, apice truncatis, 

 extus breviter spinosis, spina alba; femoribus piceo-rufis, 

 posticis elytris longioribus, apice distincte bispinosis ; an- 

 tennis piceo-rufis, articulis 2 basalibus nigris, reliquis 

 apice fuscis. 



Long. 5:^ lin. $ . 



An elegant species, of cylindrical from, distinguished 

 by the single glossy black tubercle on the disc of the 

 pubescent griseous thorax, and also by the convex pos- 

 terior part of the elytra. The basal half of the elytra 

 is glossy black, with very few punctures, and ornamented 

 at about the third of the elytral length by a whitish belt, 

 broadest on the lateral margin, and disappearing before 

 reaching the suture ; the apical half is covered with a 

 dense griseous pubescence like that of the thorax, the 

 anterior margin of this is advanced and rounded on the 

 suture, and is there edged with whitish, winch forms an 

 indistinct, oblique, and entire fascia. The antennas and 

 tibife are cai-inate, and the hinder femora are nearly linear 

 with distinct apical subequal spines. 



Hah. — River Tapajos. 



5. Octoplon stnatocolle. 



Ibidion striatucolle, White, Cat. Longic. Brit. Mus. 

 p. 224. 



Elongatum, minus convexum, breviter sparse setosum, 

 nigrum, nitidum ; thorace ina^quali, transverse forte ruga to. 



