344 PROCEEDlNdS OF THE NATIONAL MUSEUM. vol. xxix. 



Genus COSSULA Bailey. 

 COSSULA MAGNA, new species. 



Head and collar reddish Ijrowii, the latter darkest. Thorax whitish 

 with some brown irrorations. Abdomen dark brown; anal hairs buft'. 

 Primaries grey, with darker stride; inner margin, a spot at end of cell, 

 and irregular postmedial spots becoming ver}' large toward submedian, 

 blackish grey; outer margin light brown, broadly below costa, then 

 narrowing to vein 2, containing a blackish-})rown shade from veins 

 4 to 8; an antemedial tine blackish line. Secondaries dark brown. 



Expanse. — 80 mm. 



Ilahitat. — Omai, British Guiana. 



Allied to 0. iiorax Druce, but very nuich larger. 



Type.—Q^i. No. 9026, U.S.N.M. " 



Family PSYC^HID.E. 

 SYNOPSIS OF OENERA. 



Vein 1 of fore wings witli m l)raneh on the lower side. 

 Wings elongate, narrow. 



Hind wings with the apex sharp, veins all present Oiketicns 



Hind wings rounded, veins reduced in nunil)er. 



Fore wings with veins 4, 5 coincident Thyridopteryx 



Fore wings with veins 4, 5 stalked '. Biopsyche 



Wings broader, size small. 



Vein 6 present on 1 )oth wings Flatceceticus 



Vein 6 absent on both wings Hyaloscotes 



Vein 1 of fore wings without a branch below. 



Veins 4 and 6 of hind wings absent Chalia 



Veins all present; 4, 5 stalked on fore wings Thanntopsyclic 



Genus TH AN ATOPSYCHE Butler. 

 THANATOPSYCHE THORACICA, new species. 



Veins all present; 4 and 5 of both wings separate at origin. Head, 

 thorax, and base of abdomen ochreous brown, abdomen otherwise 

 grey black. Wings brown l)lack. Secondaries: the cell semihyaline. 



Expanse. — 46 mm. 



Habitat. — Omai, British Guiana. 



Tyjj€.—C?it. No. 9027. U.S.N.M. 



Genus OIKETICUS Guilding. 



OIKETICUS SPECTER, new species. 



All veins present; cell of hind wing rather short, not over two-thirds 

 the length of wing. Body dark grey-brown. Wings thinly scaled, 

 brown-grey. Primaries: a darker grey shade in and beyond cell, also 



