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11 :. Ptychopoda substrigata sp. nov. 



Foivir/m/s : chalk-white, sparingly dusted with gi'i'vish ochreous scales ; the 

 liues grey ; first curved at one-third, second at five-sixths, dentate-luuulate ; the 

 dusting thicker in the central area towards the lines ; a small black cell-spot ; 

 a greyish ochreons band before hiudmargin, separated from the cater line by a 

 white band without darker dusting ; marginal .dots small, dark ; fringe white, 

 dusted with grey. 



Ilinduings : whiter, less dusted ; outer line browner ; cell-spot and marginal 

 dots as in forewings. 



Underside white, slightly dusted ; both wings with a broad diffuse straight 

 brownish submarginal baud ; cell-spots and marginal spots distinct. Head, thorax, 

 and abdomen white. 



E.xpause of wings : 10 mm. 



One ? from faraua, Entre Rios, Argentina. 



118. Rhodostrophia obscura sp. nov. 



Forewings : pale grey, thickly covered with dark-grey scales ; no first line 

 visible ; a very indistinct darker median shade, parallel to hindmargin, passing jnst 

 beyond a cloudy dark cell-spot ; onter line fine, blackish, from four-fifths of costa to 

 three-fonrths of inner margin, irregularly waved and obscurely subcrenulate, edged 

 by a slightly paler space, beyond which the marginal area is darker grey : marginal 

 spots linear, blackish ; fringe grey. 



Hind/rings : paler grey, with traces only of two submarginal lines above 

 anal angle. 



Underside pale glossy grey, with onter line of forewings darker. Head, thorax, 

 and abdomen pale grc)', speckled with darker ; vertex, top of face, and base of 

 antennae whitish ; face and palpi dark brown. 



Expanse of wings : 28 mm. 



One <? from Chili. 



Of the same size and shape as 7?. chih'nnria Blanch. {Acidalia), but more 

 sombre in colour. 



Tricentra gen. nov. 



Forewings: with costa shouldered at base and curved just before apex whicli 

 is slightly produced ; hindmargin decidedly bent at vein 3. 



lUndwings : with hindmargin irregular, bent at vein 6 and again at vein 3, 

 subcrenulate : the anal angle strongly marked. 



Antennae of S thick, ciliated ; palpi short, porrcct ; hindlcgs of J not 

 aborted, the tibiae with three spurs. 



Neuration: forewings, cell about one-half : discocellnlar vertical ; first median 

 at two-thirds, second at seven-eighths ; radials normal ; 7, 8, U stalked ; 10 

 anastomosing with 1 1 and again with 8, 9 ; hindwings with G and 7 from upper end 

 of cell. 



Type : Tricentra Jliti-imaiyiiutta sj). nov. 



