396 Mr. A. G. Butler on new Genera 
XLIX.—Descriptions of new Genera and Species of Lepi- 
doptera in the Collection of the British Museum. By 
ARTHUR GARDINER Butter, F.L.S., F.Z.8., &e. 
Family Papilionide. 
Genus SPH£NOGONA, Butler. 
1. Sphenogona semiflava, n. sp. 
Primaries above sulphur-yellow, with a broad oblique brown 
external border, decreasing in width from the costa to the ex- 
ternal angle, and very slightly sinuated along its inner margin ; 
secondaries white, with a broad dentated brown border from 
the apex to the caudate projection ; body greenish grey ; collar 
with yellowish hairs; abdomen cream-coloured : wings below 
much as in S. gratiosa ; primaries pale sulphur-yellow, gradu- 
ally deepening in intensity towards the base, where they be- 
come saffron-yellow ; secondaries cream-coloured, with the 
outer border pale sulphur-yellow ; a few ill-defined brown 
lituree in the usual positions : body cream-coloured. 
Expanse of wings 1 inch 11 lines. 
Hab. Trinidad (H. W. Caird). Type, B.M. 
S. semiflava is most nearly allied to S. ectriva, but in colour- 
ing it approaches S. gratiosa. ; 
Genus TERIAS, Swainson. 
2. Terias butyrosa, n. sp. 
Closely allied to 7. harina, from which it differs in the con- 
siderably narrower black-brown border to the primaries. 
Expanse of wings 2 inches. 
Hab. Aru Islands (Wallace). Type, B.M. 
We have two examples of this species and seven of 7, 
harina in the collection. 
3. Terias solifera, n. sp. 
gd. Wings above bright golden yellow ; primaries with a 
broad external dark brown border, nearly as in 7. sari 2 ; 
secondaries with costal and abdominal areas whitish ; a rather 
broad, internally diffused and undulated dark brown border, 
tapering to apex and anal angle ; fringe yellow ;. body greenish 
grey ; wings below as in 7. senegalensis. 
Expanse of wings 1 inch 10 lines. 
9% Sulphurous whitish, with the bisinuated excavation in 
