OF PHYTOPHAGOUS COLEOPTERA. 



839 



drical, the humeral callus prominent, bounded within by a longi- 

 tudinal groove ; surface subnitidous on the anterior disk, opaque 

 behind the middle. Each elytron with ten rows of punctures, ap- 

 proximating in pairs and distinct on the anterior disk, obsolete 

 towards the apex of the elytron ; interspaces impunctate, faintly 

 impressed (when seen under a lens) with a few sinuous strigse. 



Separated from the male of S. licolor, the only known species 

 which with it can be confounded, by the armed intermediate 

 thighs and by the stronger punctuation of the elytra. 



Grenus Megascelis, Latr. 



Megascelis posticata, n. sp. Elongata, parallela, subcylindrica, 

 sordide fulva aureo micans, pube aurea depressa vestita, pedibus sor- 

 dide flavis, pectore nigro, abdomine obscure metallico-CBeruleo ; capite 

 (labro antennisque exceptis) viridi-aeneoj thorace piceo tincto, diraidio 

 longiorequam latiore, lateribus ante basin constrictis, dorso deplanato, 

 sat fortiter punctate, utrinque oblique impresso-strigoso ; elytris par- 

 allelis, apiee dehiscentibus, sat fortiter punctato-striatis, interspatiis 

 ante medium rude, pone medium minus evidenter rugulosis, dimidio 

 postico caeruleo-nigro. Long. 3^ lin. 



Hob. Pebas, Upper Amazons. 



Head rugose-punctate, vertex and neck smooth, nearly impunc- 

 tate ; face between the upper portion of the eyes impressed with 

 a longitudinal groove ; clypeus semilunate, its surface nearly 

 covered with two large parallel fovese, the mesial line distinctly 

 thickened ; antennae nearly two thirds the length of the body, 

 filiform, scarcely thickened towards the apex, entirely fulvous ; 

 jaws black. Thorax nearly one half longer than broad, the sides 

 moderately constricted behind the middle. Scutellum trigonate, 

 its apex broadly truncate, its surface rugose-punctate, piceo- 

 aeneous. Elytra flattened along the suture, coarsely punctate- 

 striate ; interspaces transversely rugulose, the rugae much finer 

 and less distinct towards the apex. Body beneath more sparingly 

 punctured than the upper surface ; last segment of abdomen 

 sinuate at its apex. Hinder thighs slightly thickened ; hinder tibiae 

 thickened towards the apex, the latter armed within with a short 

 stout tooth. 



Megascelis femorata, n. sp. Angustata, subcylindrica, caeruleo- 

 nigra, nitida, pube grisea parce vestita 5 capite thoraceque elongatulo 

 viridi-aeneis, antennis (apice albido excepto) pedibusque nigris, femori- 

 bus (apice excepto) pallide flavis; elytris nigris, sat fortiter punctate- 



