228 Mr. H. W. Bates' Supplement to the 



Acanthoderes bivitta. White, Cat. Long. Brit. Mus. 

 - , p. 354 (^Steirastoma). 



A widely-distributed species, Amazons; Cayenne; Nica- 

 ragua. 



Acrocinus longimanus, L. 



Oreodera ohsoleta, n. sp. O. costaricensi sirailis. 

 Modice elongata, paulo convexa, sordide Mvo-fusca ; 

 thorace disco tuberculis concoloribus duabus, lateribus 

 obtuse tuberosis; elytris crista, basali parva penicillata, 

 apice breviter truncatis, supra sparsira punctatis postice 

 lineolis indistincte fulguratis, griseis, sericeo-fusco margi- 

 natis ; antennis articulis basi griseis ; tibiis griseo-annu- 

 latis. 



Two examples. 



Very similar in sbape to O. costaricensis ; having also a 

 similar thorax and small, penicillated basal crests on the 

 elytra ; but the general colour quite different, being, in- 

 stead of grayish-olive, tawny or ruddy-brown. The elytra, 

 too, have no trace of brown, silky fascias, but are marked 

 with fine streaks of lighter and darker hue, generally 

 longitudinal and somewhat zig-zag in direction. The 

 thorax is sparingly but strongly punctured throughout. 



Oreodera semialba, n. sp. Latior, oblonga, depressa ; 

 atro-flisca, elytris plaga magna communi lateraliter sinu- 

 ata, cinereo-alba ; thorace lato, transverso, disco tuber- 

 culis tribus elfevatis nitidis, lateribus tubere magno ; elytris 

 basi latis quadratis, postice attenuatis, apice subsinuatim 

 truncatis et extus acute spinosis, supril basi nitide sparsim 

 granulatis, delude sparsissime punctatis. Long. 8 lin. S . 



One example. 



A very distinct species, rather shorter but similar in 

 form to O. glauca. General colour very dark brown, 

 clothed with fine, smooth grayish-brown pile. The thorax 

 has on the disk three prominent, shining tubercles, arranged 

 in the usual triangular position ; the anterior and posterior 

 borders have a row of large punctures, but the disk is very 

 sparingly punctured ; the large, conical, side tubercles have 

 a sharp ring-groove round their base as in Acrocinus 

 longimanus. The large gi-ayish chalky-white patch of 

 the elytra^ is a modification of the usual gray patch in 

 other species, but it is not continued along the posterior 



