458 Sir G. F. Hampson on 



costa and white postmedial band defined on inner side by 

 black suffusion except on inner area. 



Hub. Sierra Leone, 1 ? type. Exp. 66 mm. 



Allied to C. liturata, AA'lk., from India. 



Centra argentescens, sp. n. 



^ . Head and thorax white mixed with black ; pectus and 

 lower part of frons black ; antennas with the branches black ; 

 pectus black-brown ; legs white mixed with black-brown, 

 the tarsi ringed with brown ; abdomen with the basal half 

 white, with some black hair at base, the terminal half black- 

 brown > the ventral surface white. Fore wing silvery white 

 slightly irrorated with blackish ; subbasal line double, 

 waved, angled inwards in submediau fold, the area- between 

 it and antemedial line suffused with black from costa to 

 median nervure and thickly irrorated with black on inner 

 area ; antemedial line double, angled outwards in submedian 

 fold and bent outwards to inner margin ; medial line in- 

 distinct, double, waved, enclosing a tuft of black scales 

 on discocellulars; postmedial line double, bent outwards 

 below costa, incurved at discal and submedian folds, some 

 small black spots beyond it on costa, and some black suffu- 

 sion from costa to vein 4 and from vein 2 to tornus ; a 

 terminal series of strong black strise. Hind wing silvery 

 white, the veins tinged with fuscous ; a rather diffused 

 oblique fuscous postmedial line; a terminal series of small 

 black spots. Underside of fore wing fuscous brown j hind 

 wing with medial fuscous bar from costa, the postmedial 

 line distinct and excurved below costa. 



Hab. Natal (Lidgedon), 1 $ type. Exp. 40 mm. 



Allied to C. liturata, Wlk. 



Centra esmeralda, sp. n. 



g . Head, thorax, and abdomen pale blue-green, the hair 

 on vertex of head whitish ; palpi and sides of frons black ; 

 a black spot on vertex of head ; branches of antennas black- 

 brown ; a black band behind tegulse, the patagia with black 

 annuli, the meso- and metathorax with paired black spots ; 

 tibiee and tarsi banded with black. Fore wing pale blue- 

 green ; a short black streak below base of cell ; a subbasal 

 black striga from costa ; antemedial line black defined on 

 inner side by silvery white, forming an annulus at costa and 

 produced to a slight black streak below the annulus, ex- 



