OP PHYTOPHAGOUS COLEOPTEEA. 341 



wanting). Thorax rather broader than long ; sides parallel, 

 slightly rounded, slightly constricted before the base ; disk di- 

 stinctly flattened, very faintly depressed across its middle, the 

 depression terminating on each side in a large distinct excavation, 

 the surface of which is stained with metallic green ; j ust in front 

 of the base are also some irregular concolorous markings ; upper 

 surface very smooth and shining, sparingly clothed with adpressed 

 fulvous hairs, very distantly punctured behind the apex, rather 

 more closely so towards the base and on the sides. Scutellum 

 trigonate, its apex broadly truncate. Elytra much broader than 

 the thorax, parallel, depressed along the suture, rather strongly 

 punctate-striate ; interspaces nitidous, transversely rugulose, 

 the rugse nearly obsolete towards the apex. 



G-enus Megalostomis, Laeord. 



Megalostomis placida, n. sp. Anguste oblonga, subcylindrica <?, 

 magis ovata $ , fulvo-picea, subtus pube sordide albido-fulva adpressa 

 dense vestita, supra minus dense fulvo-sericea, antennis dilatatis 

 nigris ; labro, vertice, oculorum oi-bitis, thorace basi et apice, elytro- 

 rum callo humerali limboque angusto, pygidii apice tarsisque nigro- 

 piceis ; thorace subcrebre punctate ; elytris leviter rugulosis, minus 

 crebre punctatis. Long. 4-4f Hn. Mas. Capite magno, lato. 



Hob. Ega, Upper Amazons. 



Head rather closely punctured, space between the eyes broadly 

 excavated on either side, the excavations separated by a narrow 

 longitudinal ridge which extends downwards across the clypeus ; 

 vertex impressed with a small fovea ; antennse short, three lower 

 joints nigro-piceous, the rest black, the basal joint strongly thick- 

 ened, rotundate-ovate, the second and third short, equal, submo- 

 niliform, the fourth obovate, moderately dilated, the fifth to the 

 eleventh compressed, laterally broadly dilated. Thorax more 

 than twice as broad as long ; sides straight, parallel in the c? , 

 converging in the $ , slightly sinuate before the middle, the an- 

 terior angles acute, slightly excurved ; basal margin sinuate on 

 either side the median lobe, the latter produced, obtusely truncate ; 

 above transversely convex, somewhat closely punctured, the in- 

 terspaces between the punctures granulose-punctate ; at the base, 

 m front of the median lobe, are three large, shallow depressions, 

 the middle one perpendicular, the lateral ones oblique ; surface 

 clothed with adpressed hairs, rather more densely placed on the 

 sides than on the disk. Scutellum large, trigonate, the sides 



