340 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 50. 



by a fuscous brown shade, which crosses the line at vein 7 to apex; 

 a dark terminal line. Hind wings tinged with brown; the postmedial 

 white line and buff shading only from vein 4 to vein 2. Fore wings 

 ])elow dull greyish brown, the costal margin mottled with yellow 

 buff; a faint disc.ocellular streak and postmedial line; sub terminal 

 buff white spots from costa to vein 6. Hind wings below brown 

 thicldy irrorated with buff; a dark postmedial line; subterminal line, 

 whitish, macular, better marked on fold and at anal angle. 



Expanse. — 28 mm. 



Habitat. — Cayenne, French Guiana. 



Type.— Cat. No. 19813, U.S.N.M. 



MEGATOMIS SEMIOTHISA, new species. 



Male. — Body and wings pale lilacine brown, with a few dark striae 

 and irrorations. Fore wings: An antemedial dark line, very faint; 

 orbicidar small yellowish white, darker edged; reniform similar, 

 linear, oblique; postmedial line remote, very fine, fuscous, edged out- 

 wardly with white, then with light bro^vn, which is divided by a dark 

 brown subterminal line, geminate towards inner margin; these lines 

 and shades close together forming a subterminal fascia; a terminal 

 dark lunular line. Hind wings similar, without the antemedial line. 

 Wings below whitish buff, striated with brown; a single fine post- 

 medial line, rather indistinct. 



Expanse. — 26 mm. 



Habitat. — Rockstone, British Guiana. 



Type.— Cat. No. 19814, U.S.N.M. 



MEGATOMIS SUBMARCATA, new species. 



Male. — Palpi outwardly dark brown. Frons brown; vertex white. 

 Collar and thorax irrorated with brown. Abdomen grey brown, more 

 darkly irrorated; whitish segmental lines; basal segment whitish buff. 

 Fore wings: Costal margin whitish buff striated with brown, except 

 apically; l^asc and medial space dark brown; outer space lighter 

 brown, the tennen shaded with white from apex to vein 4, and at 

 tornus; antemedial line outangled, white; orbicular linear, oblique, 

 white; reniform white, narrower in front, expanding behind; post- 

 medial outangled on costa, fuscous, inbent sinuous, white from vein 

 6 to iimer margin. Hind wings brown, shaded with fuscous medially; 

 postmedial line broad, white; a subterminal Avhitish line expanding 

 at anal angle; a terminal fuscous brown line on both wings. Wings 

 below mottled white and buff with dark brown striae; lines heavy, 

 brown black; a terminal wavy dark line. Fore wings: Antemedial in 

 cell before the oblique white orbicular; medial space in cell brown 

 black; a dark curved line on discocellular followed by a white shade; 

 postmedial line vertical; dark spots from vein 6 to apex. Hind 



