202 Mr. J. S. Baly on new species of Phytophagous Beetles, 



oblong black patch ; the transverse band on the elytra more 

 dilated towards the suture. 



Hab, Ega, Upper Amazons. Var. A. Peru. 



Mastostethus PascoeL PL V. fig. 7. 



M. oblongus, supra pallida fulvus ; antennis (artieulis intermediis ex- 

 ceptis) nigro-piceis ; capitis maculis duabus, thoracis macula dis- 

 coidali, elytrisque plaga magna communi ovata a basi ultra medium 

 extensa maculaque apicali nigris ; subtus fulvus ; pleuris, femorum 

 maculis, tibiisque anticis quatuor supra, tibiis tarsisque posticis 

 totis nigris. — Long. 4 lin. 



Oblong, pale fulvous above. Head smooth, finely punctured, 

 lower portion of face separated from the clypeus by a deeply 

 grooved transverse line ; a patch on the hinder vertex and an 

 oblong spot between the eyes black ; antennae pitchy black, in- 

 termediate joints fulvous; eyes piceous. Thorax transverse, 

 narrowed from the base to the apex ; above slightly convex from 

 side to side ; surface shining, minutely but not closely punctured, 

 impressed near the hinder angles with a distinct fovea ; fulvous, 

 a transverse patch on the disk, emarginate in front, pitchy 

 black. Scutellum black. Elytra subovate, slightly convex, sub- 

 depressed above, narrowed and rounded towards their apex, the 

 latter dehiscent ; surface distinctly punctured ; fulvous, a large 

 ovate common patch, extending from the base to beyond the 

 middle, and occupying nearly the whole surface, together with 

 a subtriangular spot at the apex, black. Beneath fulvous, spa- 

 ringly covered on the legs and abdomen with coarse concolorous 

 pubescence ; some irregular patches on the pleurse, the hinder 

 pair of tibiae and tarsi, the upper surface of the four anterior 

 tibiae, and three oblong patches, one on both the upper and 

 lower surfaces of the intermediate pair of thighs, and the third 

 on the outer surface of the hinder pair, black. 



Hah, Ega. Collected by Mr. H. W. Bates. 



Mastostethus Jekelii. 



M. anguste oblongus, subparallelus, dorso subdepressus, pallida ful- 

 vus ; elytrorum apica anticeque fascia lata communi, extrorsum 

 abbreviata, margine postico leniter angulata, famoribusque posticis 

 extrorsum, nigris ; plauris macula, oculis tibiisque quatuor anticis 

 extrorsum, nigro-piceis. — Long. 4 lin. 



Narrowly oblong, subparallel, slightly subdepressed above; 

 pale fulvous. Head finely but subremotely punctured, punc- 

 turing closer and more deeply impressed along the inner border 

 of the eyes, the latter nigro-piceous. Thorax twice as broad as 

 long at the base; sides nearly straight, narrowed from the base 



