230 Mr. J. S. Jiaiys, descriptions of 



medial lobe, the latter broad, transversely truncate ; upper 

 surface subcylindrical, transversely impressed just in 

 front of the basal lobe and for a short distance on either 

 side ; strongly rugose-punctate on the sides, rather more 

 distantly punctured on the disk. Scutellum rather broader 

 than long, trigonate, its apical angle obtuse ; surface closely 

 rugose-punctate, transversely thickened at the base, con- 

 cave near the apex. Elytra oblong, very slightly at- 

 tenuated towards the apex, the latter truncate, not de- 

 hiscent at the suture, sides only slightly lobed ; above 

 convex, flattened along the suture, faintly depressed trans- 

 versely below the base and again below the middle, the 

 basal margin close to the scutellum, together with the 

 truncate apical border thickened ; surface deeply and 

 closely punctured, interspaces thickened and irregularly 

 rugulose; on each elytron are several raised longitudinal 

 vitt£e, fine and indistinct on the disk, thickened and form- 

 ing irregular rugae at the apex. 



Genus Metallactus, Suffr. 

 Metallactus eximius. 



Subquadrato-oblongus, valde convexus, flavus, nitidus, 

 metathorace utrinque macula, scutello, verticis macula, 

 oculis antennisque (articulis duobus ultimis exceptis), 

 nigris ; elytris irregulariter punctato - striatis, punctis 

 piceis; striis prope suturam et iis disci exterioris con- 

 fusis ; utrisque plaga basali longitudinali, intra callum 

 humerale posita margineque humerali nigris. 



Long. 2 — 2 1 lin. 



llab. Banks of the Amazon, Para, Santarem. 



Vertex smooth, minutely but not closely punctured; 

 front narrow, impunctate, impressed with a medial longi- 

 tudinal groove; eyes large, oval, deeply notched; antennge 

 half the length of the body, rather longer in the $ , fili- 

 form, scarcely thickened towards the apex; the eyes, 

 interocular canthi, the apices of the jaws and a large 

 ti'igonate patch on the vertex black ; antennge also black, 

 the two upper joints flavo-fulvous. Thorax more than 

 twice as broad as long ; sides rounded and converging 

 from base to apex, all the angles produced laterally into a 

 subacute tooth ; basal margin straight on either side, 

 medial lobe slightly but distinctly produced, broadly trun- 

 cate ; above transversely convex, remotely impressed with 

 deep punctures. Scutellum trigonate, its apex truncate. 



