126 Mr. Baly nn new Phytophagous Coleoptera. 



the outer one quadrangular jjlaced just helow the basal spot, two 

 across the middle, the inner close to the suture, the outer not 

 far from the lateral margin and sending from its antero-external 

 angle a narrow sub-marginal vitta to the basal margin, the fourth 

 larger than any of the preceding, and subquadrangular is situated 

 below the middle near the outer margin, and lastly a large tri- 

 gonate patch which occupies the whole of the apical surface of 

 each elytron and is only separated from the apex itself by a 

 narrow marginal line ; the anterior border of this patch is very 

 irregidar. 



Mastostet]ia!< Jansni/i, mihi. 



Elongatus, postice vix attenuatus, subdepressus, liavus, capite 

 thoraceque fulvis ; pleuris, capite inter oculos et macula verticali, 

 antennis brevioribus (apice pallido excepto), thoracis plaga 

 magna basali, tarsis, femoribus et tibiis anticis quatuor dorso, 

 posticisque totis nigris ; elytris distincte punctatis, nigris, utris- 

 que linea marginaii ante medium abbreviata, vitta obliqua cur- 

 vata basi, fasciaque communi i)one medium pallide Havo-albidis. 

 Long. 4 lin. 



Hab. Banks of the river Amazon, a single specimen in my 

 collection. 



Head smooth, vertex impunctate, face between the eyes punc- 

 tured on either side, the intermediate space impunctate ; antennae 

 considerably less than half the length of the body, slender, six 

 lower joints black, the others yellowish white, the 7th — 10th 

 stained above with black. Thorax tAvice as broad at the base 

 as long, sides converging from base to apex, very slightly 

 rounded, angles acute, surface smooth, impunctate, impressed at 

 the base on either side with a large deep fovea ; a large trans- 

 verse quadrangular patch at the base, together with a narrow 

 line in the middle of the apical border black, the basal margin 

 between the (quadrangular patch and the lateral angle also 

 narrowly edged with the same colour. Scutellum trigonate, 

 rounded on the sides, the apex acute. Elytra broader than the 

 thorax, slightly attenuated from the bas(:; towards the apex ; 

 above depressed, finely punctured, black, each with a narrow 

 vitta, commencing at the shoulder and terminating before the 

 middle of the lateral border, a broad slightly curved vitta which 

 runs obliquely outwards from the scutelluni towards the outer 

 disk, terminating just before the middle of the latter, together 

 with a common transverse band placed below tlu^ naddle, nearly 

 halfway between the latter and the apex, yellowish white. 



