82 Mr. A. G. Butler 071 the 



cepting that there is a large black patch at the base of the 

 jjrimaries: expanse 1 inch 7 lines. 



E.io Juriia, 12th November, 1874 (two males). 



157. Hydrias plana. 



Hi/drias plana, Walker, Lep. Het. vi. p. 1402 

 (1855). 

 Rio Jutahi, 27th and 30th January, 1875, 

 H. mollis of Sepp is allied to this species ( Surin. Vlind. 

 pi. 22). 



158. Hydrias obsoleta ? 



Fhalcena {Attacus) obsoleta, Cramer, Pap. Exot. iv. 

 pL 304, %. C. (1782). 

 9. Parana, 6th June, 1874; $ . Rio Juruti, 6th Novem- 

 ber, 1874. 



What I take for the male is allied to //. ruhUjinosa of 

 Felder. 



159. Hydrias melancholica, n. sp. 



Allied to H. incivilis but altogether darker, the prima- 

 ries longer and rather narrower, not red at base; the 

 discal spots of all the wings less black; secondaries with 

 no red on the subcostal branches, abdominal half of the 

 wing very slightly paler than the costal area ; dotted 

 white lines similar; under surface altogether darker and 

 greyer: expanse 1 inch 5 lines. 



Rio Solimoes, 9th December, 1874. 



160. Hydrias erebina, n. sp. 



Primaries above fuliginous brown, very dark ; internal 

 area paler; a very pale external semicircular apical patch, 

 crossed by a slightly undulated and centrally angulated 

 black submarginal line; a slightly zigzag discal series 

 of whitish dots from costal to inner margin, and a second 

 less distinct but similar series across the basal third of the 

 Aving ; secondaries paler broAvn, sericeous ; apex of costal 

 area blackish, crossed by a Avhitish spot ; body corre- 

 sponding in coloxu' with the wings, the thorax being dark 

 and the abdomen lighter; under surflice altogether paler, 

 wings sericeous pale brown, with the veins whitish ; costal 

 margins and subcostal branches more or less clay-coloured; 

 subcostal area, excepting at apex, greyish; each wing 

 with a white costal spot towards apex ; primaries with an 

 oblique apical Avhite patch; a submarginal series of grey- 

 ish spots ; body below tinted with pink : expanse 1 inch 1 line. 



Cupari, Rio Negro, 19th ehme, 1874. 



