MICROLEPIDOPTERA OF NEW GUINEA 
101 
PLUTELLIDAE 
Key to the Papuan genera of Plutellidae 
1. Hind wing with vein 3 absent Dieda gen. nov. 
Hind wing with vein 3 present 2 
2. Antenna thickened with scales towards base Eidophasia Stephens 
Antenna not thickened 3 
3. Fore wing with vein 7 absent; hind wing with veins 3 and 4 nearly parallel 
Erysimaga Meyrick 
Fore wing with vein 7 present ; hind wing with veins 3 and 4 approximated, 
connate or stalked 4 
4. Fore wing with veins 7 and 8 stalked ; scape of antenna with a slight pecten 
Niphodidactis Meyrick 
Fore wing with veins 7 and 8 separate; scape of antenna with eyecap or flap 
of scales ® 
5. Median segment of palpus smooth ; scape of antenna with eyecap 
Scaeoph-anes Meyrick 
Median segment of palpus with a tuft beneath; scape with a flap of scales . . 
Plutella Schranck 
Eidophasia Stephens, 1842 
Eidophasia Stephens, 1842, 111. Brit. Ent. Suppl., p. 418. Meyrick, Lepid. Catal., 
fasc. 19, p. 48, 1914. Fletcher, Mem. Agric. Ind., Ent., vol. 11, p. 74, 1929. 
Eidophasia peristigma spec. nov. (fig. 814) 
negi = throughout, art ypa = a dot 
£ 17 mm. Head and antenna white, flagellum of the latter indistinctly 
ringed with fuscous along anterior half, towards base moderately thickened 
with white scales above, scape in front with a large flap of white scales 
with infuscated tips. Palpus white, slightly infuscated along anterior edge. 
Thorax sorded white, edged throughout with a narrow blackish-fuscous 
suffusion, forming more or less distinct marginal dots, a faint median 
blackish-fuscous streak anteriorly, tegula white, shoulder blackish. 
Abdomen whitish. Legs whitish, densely suffused with dark fuscous, 
except on articulations of segments, posterior leg creamy-white, not 
suffused. Fore wing elongate-ovate, costa curved, more so towards 
extremities, apex pointed, termen rounded, oblique. White, slightly 
suffused throughout with pale ochreous -fuscous. A rather broad longi- 
tudinal streak of cloudy grey suffusion from base of costa towards fold 
beyond base, thence tolerably parallel to dorsal edge, limited below by 
fold ; beyond lower angle of cell this streak dissolved into grey irr oration 
which does not reach tornus; other markings formed by small blackish 
transversely erect dots; a rather indistinct costal row terminating in two 
to three larger transverse marks at about 3 / 4 , a subcostal row reaching 
to middle of wing, some two more longitudinal row r s in disc beyond middle, 
followed by a denser irroration and a slight fuscous suffusion beyond cell, 
