LamelUcorn Beetles from Brazil. 459 



Hah. N. Argentina (Gran Cliaco) : Rio Salado. 



Two specimens were sent to the British Museum by 

 Mr. E. Wagner. 



The shining, metallic, thinly setose surface renders this 

 very easily distinguishable. 



Pedaridium argenllnum, sj). n. 



Nigrum, vol nigro-brunneum, nitidum, erecte griseo-setosum, pedibus 

 obscure riifis, antennis flavis : elongafcum, capite rugoso, margine 

 arcuato, medio emarginato ot utrinque acuto dentato ; prouoto 

 convexo, profunde sat a^qualiter ot crebre punctato, lateribus 

 ante medium fere rectis, post medium late rotundatis, basi medio 

 obtusissime angulato ; elytris anguste sat profunde striatis, 

 interstitiis planis, iitroquo liueis punctorum duabus oruato, 

 pimctis paulo vage impressis, cum striis nexis, setiferis. 



Long. 4-4*5 mm. ; lat. 2-5 ram. 



Ifah. N, Argentina (Gran Chaco) : Icano, Rio Salado. 



Taken by Mr. E. Wagner. 



This is more elongate than P. setosum ; the head is rugose 

 and not distinctly punctured, and the punctures of the elytra 

 are not so sharply defined, but occupy depressions which are 

 connected with the stride. 



Chceridium trident iceps, sp. n. 



Nigro-piceum, nitidum, late ovatura, convexum; capite leviter punc^ 

 tato, trituberculato, margine antico acute bidentato ; pronoto con- 

 vexo, subtiliter punctulato, postice medio fortiter sulcato, margine 

 postico crebre lineato-punctato ; elytris sat fortiter striatis, striis 

 transverse baud grosse aut crebre punctatis, interstitiis minute 

 punctulatis ; pygidio antice piano, dense et fortiter punctato, 

 postice convexo, fere loevi : 



J , tibiis anticis longissimis, prope flnem acute 3-dentatis, supra 

 denticulatis, calcare bifido armatis. 



Long. 8 mm. ; lat. 5 mm. 



Eab. RIattoGrosso: Madeira-Mamore Railroad, Camp 28. 



A single male was found by i\Iessrs. ]\Iann and Baker. It 

 differs from all hitherto known in its head armed with three 

 small tubercles, of which the two lateral ones are placed at 

 the ends of the obsolete sutures of the ocular lobes. It has 

 somewhat the form and size of C. squalidum, F., but is more 

 convex, the pronotum has a strongly punctured basal line, 

 and the elytral stiiiie are distinctly but not closely punctured. 

 The pygidium is convex and shining, except at the base, 

 where it is strongly and densely punctured. The front legs 



