200 Mr. J. S. Baly 07i new species of Phytophagous Beetles. 



and apex, impressed on either side near the posterior angles with 

 a distinct fovea ; surface smooth and shining, glabrous^ the entire 

 limb yellowish white. Scutellum smooth and shining, trans- 

 versely grooved, its apex yellowish white. Elytra oblong, parallel, 

 convex above, transversely depressed below the scutellar space, the 

 latter slightly elevated, surface closely punctured, bright purple, 

 covered with black hairs ; a small spot on the shoulder, a trans- 

 verse patch just within the apical border, and a transverse band 

 across the middle, abbreviated at the extreme outer margin, 

 yellowish white. Beneath black ; head, thorax (a small spot 

 on either side the latter excepted), coxae, and the under surface 

 of all the thighs, yellowish white ; hinder pair of thighs nearly 

 as long as the elytra, thickened, ovate, more convex on the 

 upper border. 



Hab, Ega, Upper Amazons. Collected by Mr. H. W. Bates. 



Mastostethus thoracicus. 



M. obloiigus, subdepressus, flavus ; antennis, facie inter oculos ver- 

 ticeque, thoracis plaga, elytrorum dimidio postico lineaque sub- 

 marginali antice, tibiis tarsisque posticis, nigris. — Long. 5 lin. 

 Var. A. Thorace maculis duabus parvis nigris notato. 



Oblong, subdepressed, deep fulvous. Head shining, indi- 

 stinctly punctured on the vertex, closely and deeply punctured 

 along the inner margin of the eyes; face separated from the 

 clypeus by a deep transverse groove; antennse, apex of jaws, 

 and a large patch covering the upper half of the face between 

 the eyes and extending backwards across the middle of the ver- 

 tex, shining black. Thorax twice as broad at the base as long ; 

 sides straight, narrowed from the base to the apex; above 

 transversely convex, indistinctly punctured, impressed at the 

 hinder angle with a deep fovea ; a large transverse patch, cover- 

 ing the middle of the disk, black. Elytra oblong, subdepressed 

 above, narrowed behind, apex rounded, dehiscent at the suture ; 

 surface distinctly punctured, puncturing much finer and less 

 distinct towards the apex ; posterior half of each elytron, and a 

 narrow submarginal line, running upwards as far as the shoul- 

 der, shining black, rest of the surface deep shining fulvous. 

 Beneath bright fulvous, sparingly covered with concolorous 

 hairs ; hinder pair of tibiae and tarsi black, covered with similarly 

 coloured pubescence. Apex of anal segment in the male with a 

 shallow semicircular impression, in the female with a deep semi- 

 circular fovea, in the middle of which is a distinct circular punc- 

 ture. 



Var. A. Thorax marked with two small black spots. 



Hab. Ega, Upper Amazons. 



