266 PROCEEDING!^ OF THE NATIONAL MV^ETJM. vol.50. 



minal similar, finely dentate; terminal fuscous brown spots on inter- 

 spaces. Hind wings paler, especially on inner margin, more evenly 

 tinged with brown; dark postmedial and subterminal lines, better 

 defined at vein 2, outwardly shaded with buff towards inner margin; 

 a dark brown lunular line. Hind wings below thicldy irrorated with 

 brown, the lines as above, but more distinct; a fuscous brown streak 

 on discocellular. 



Expanse. — 34 mm. 



Habitat. — St. Laurent, Maroni River. 



Type.— Cs^t. No. 19692, U.S.N.M. 



The genus also includes Margiza purpuraria Dognin.^ 



Genus MELANOMMA Grote. 

 Melanomma Grote, Trans. Amer. Eut. Soc, vol. 5, 1875, p. 117. 



Male. — Palpi upturned; second joint roughly scaled, barely reach- 

 ing above vertex; third joint smooth, acuminate, very short. Anten- 

 nae pectinated. Legs slender, smoothly scaled. Wings narrow. 

 Fore wings: Costa convex; apex rounded; outer margin obhquely 

 rounded; vein 3 from before lower angle; 4 from lower angle; 5 above 

 angle; upper angle of cell rounded; 6, 7, 8 equally apart; 9 on long 

 stalk with 8; 10 from cell close to S; 11 free. Hind wings: Veins 3 

 and 4 and 6 and 7 stalked; 5 well above angle. 



Type of genus. — Melanomma auricinctaria Grote. 



Genus DITROGOPTERA Hampson. 

 Ditrogoptera Hampson, Trans. Ent. Soc. Lond., 1898, pt. 3, p. 256. 



Palpi short, upturned, not reaching vertex; second joint fringed 

 with hair toward extremity; third mmutc. Antennae of female 

 almost simple. Legs long and slender, the spurs long. Fore wings: 

 Vein 6 from below upper angle; 7 from angle; 8 and 9 stalked; 10 

 from cell; 11 anastomosing with 12; outer margin excised below apex. 

 Hind wings: Veins 3 and 4 from lower angle; 5 below middle of dis- 

 cocellular; 6 and 7 stalked; outer margin bilobed, being deeply 

 excised between veins 5 and 6, then oblique and the inner margin 

 short. 



Type of genus. — Ditrogoptera trilineata ^ Hampson. 



Genus HYPOECHANA Druce. 



Hypoechana Druce, Biol. Ceutr. Amer., Ilet., vol. 1, 1891, p. 481, pi. 40, fig. 8. 



Male. — Palpi upcurved, reaching above vertex, slightly fringed in 

 front and behmd; third johit half as long as second. Antennae 

 pubescent fasciculate; a tuft of hairs about middle of shaft. Legs 



1 net. Ami'T. Slid, fasc. 8, 101), p. 72. 



s Trans. Ent. Soc. Loud., 1S9S, pt. 3, p. 250, pi. 17, fig. 20. 



