340 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxix. 



Hind wings with vein 8 free. 

 A(^cessory cell absent. 



Veins 7 and 8 stalked, 9 from the cell Lentagena 



Veins 8 and 9 stalked, 7 from cell or nearly so Trigena 



Accessory cell present. 

 Fore wings with vein 11 from the discal cell. 



Wings broad and ample Cossus 



Wings narrower, more produced Ilypopta 



Fore wings with vein 11 from the accessory cell. 



Vein Ic. of fore wings present; palpi moderate Cossula 



Vein Ic. absent; palpi very long, deflexed, hairy Acousmaticus 



Genus HEMIPECTEN Dyar. 

 HEMIPECTEN ECPARILIS, new species. 



Head and thorax black; .some greenish scales on frons. Abdomen 

 blackish brown. Primaries dark leaden grey, irrorated with bulf on 

 outer half of costal margin and be^^ond cell between veins 2 and 4; 

 lines velvety black; a basal line; an antemedial line bifurcating in 

 cell, the basal branch bifurcating on inner margin; the postmedial 

 geminate and wide apart on costa, meeting at vein 5 where it is also 

 joined by the subterminal, the lines again diverging. Secondaries 

 whitish buff, reticulated with light brown, the inner margin broadly 

 darker brown. 



Expanse. — 50 mm. 



Halr'dat. — Rio de Janeiro, Brazil. 



Type.-C^t. No. 9013, U.S.N.M. 



HEMIPECTEN ACUTIPENNIS, new species. 



Frons gre}'; vertex dark velvety brown; collar silvery buff. Tho- 

 rax and abdomen dirt}" white; some reddish brown scales posteriorly 

 on thorax. Primaries dirty silvery white; a large dark velvety brown 

 spot in cell; a small one below it and one on inner margin, nearer the 

 base than the spot in cell; a brown streak from cell to apex; costa 

 greyish brown on apical two-thirds; a brown shade on outer margin, 

 narrow below apex and widening toward inner margin, on which are 

 darker brown lines and a white shade. Secondaries whitish; the viens 

 on outer half and outer margin narrowly greyish. 



The female has the primaries reticulate with brown, the spot in the 

 cell very much larger and coalescing with the spot below cell; no spot 

 on inner margin. Body and secondaries dark grey. 



E.r}niniie. — Male, 39 mm.; female, 47 mm. 



Hah! tat. — Maroni River, French Guiana. 



Tijpr.~Q^t. No. 9014, U.S.N.M. 



HEMIPECTEN COSSULOIDES, new species. 



Head pale butf, irrorated with brown; collar and thorax white, 

 thinly irrorated with light brown; abdomen brown grey, Priuiaries 



