482 Mr. M. Jacoby on 



Head closely rugose punctate as well as the clypeus, the latter 

 bounded above by the usual smooth, metallic callosities, eyes large, 

 antennte slender, longer than half the length of the body, black, the 

 lower four joints fulvous, the third joint slightly shorter than the 

 fourth, terminal joints somewhat widened ; thorax of somewhat 

 subcylindrical shape, not more than one-half wider than long, the 

 sides rounded at the sides, very little narrowed anteriorly and 

 posteriorly, the surface extremely closely impressed with round and 

 strong punctures, the interstices finely rugose, metallic green, with a 

 slight cupreous retlection ; elytra oblong, wider at the base than the 

 thorax, more strongly punctured, the punctures more regularly 

 placed in rows although not to any marked degree, the interstices 

 finely wrinkled ; below more bluish in colour, the tibise and tarsi 

 piceous, the anterior ones in the male triangularly dilated. 



Hob. Rio Janeiro. 



It is very probable that this insect is the representative 

 of a new genus very closely allied to Colasjiis, of which it 

 has nearly all the structuial characters except that of the 

 thorax. This part is of a much more convex, narrow 

 and subcylindrical shape than in any other species of the 

 genus, and the sides are devoid of teeth or angles, in the 

 male at least ; in the female an obsolete angle is visible at 

 the middle however, and the thorax is slightly broader. 

 The insect likewise greatly puzzled the late Lefevre, who 

 placed it doubtfully in Colaspis and gave it {in Hit.) the 

 name I have retained. The female differs greatly by the 

 strongly raised costse of the elytra, but scarcely iu any 

 other way. 



Rhahdoptcrus peniensis, s\i. n. 



Ovate, broad, black, the basal joints of the antenna; fulvous, thorax 

 sparingly and finely punctured, elytra strongly subgeminate punctate- 

 striate, the interstices longitudinally costate, strongly so at the apex. 



Length 7 millim. 



Mas. Of rather broad and robust shape, black, without metallic 

 gloss, the head finely and closely punctured at the vertex, the middle 

 and the clypeus rather more strongly punctured, antennas extending 

 to the middle of the elytra, black, the basal three or four joints more 

 or less fulvous l)elow ; thorax twice as broad as long, slightly widened 

 at the middle, the sides straight at the base, subangulate before the 

 middle and from thence narrowed towards the apex, with a narrow 

 reflexed margin, anterior angles acutely pointed, the surface convex, 

 remotely and finely pi^nctured ; elytra narrowed at the apex, with a 



