10 
MICROLEPIDOPTERA OP NEW GUINEA 
Ostium moderate. Limen, a subtriangular plate with a moderate 
thickening at each side, the lower extremity rounded, the upper rim 
straight. Ductus bursae broad, short. Cestum, a broad semitubular plate. 
Bursa copulatrix ovoid. Signum stellate, situated on a rounded plate. 
(Slide no. 1116 D, type.) 
Scree Valley Camp, 3800 m, September 16, 1938. One specimen. 
Thiotricha Meyrick, 1886 
Thiotricha Meyrick, 1886, Trans. N. Zeal. Inst., vol. 18, p. 164. Journ. Bomb. Nat. 
Hist. Soc., vol. 18, p. 439, 1908. Gener. Ins., fasc. 184, p. 101, 1925. Rev. Handb., 
p. 638, 1928. Fletcher, Mem. Agric. Ind., Ent., vol. 11, p. 221, 1929. Gaede, 
Lepid. Catal., part 79, p. 42, 1937. 
Mystax Caradja, 1920, Iris, vol. 34, p. 136. 
Key to the Papuan species of Thiotricha 
1. A jet-black dot in apex chionochrysa spec. nov. 
Grey transverse fasciae at middle and towards apex. . .nephelodesma Meyrick 
Thiotricha chionochrysa spec. nov. (fig. 556) 
yio'jv = snow, %qvoo; - gold 
q 11 mm. Head snow-white, shining pale golden. Antenna white, 
towards the apex becoming suffused with dark grey. Palpus white, terminal 
segment suffused with greyish. Thorax pale ochreous, suffused with light 
greyish-fuscous except along sides, tegula white with a golden shine. 
Abdomen ochreous-white, glossy, anal tuft dull pale ochreous. Legs 
fuscous-whitish, anterior and median tibia and tarsus infuscated above, 
posterior tibia with a suffused subapical band and apical spurs, grey. 
Fore wing lanceolate, moderately pointed. Shining whitish-golden, 
becoming deeper golden posteriorly, especially along the posterior fifth 
of the costa ; a narrow dark grey streak along the base of the costa ; faint 
greyish elongate patches, imperceptible in certain lights, above dorsum 
at 3 / 4 of wing, and along the both margins of the posterior fifth of the wing 
to before the apex; apex pure white with a round jet-black dot. Cilia pale 
golden, along the dorsum becoming whitish anteriorly, along the costa 
and around the apex with greyish tips. 
Tegumen weak, fin el}' haired along its edge. Valva narrow, cucullus 
dilated and rounded. Vinculum submembraneous, with a broad saccus, 
laterally with a curved acute process. Aedoeagus strongly sclerotized, 
rather short, top trumpet-like. C’ornutus, a sinuate spine. (Slide no. 
1120 D, type.) 
Baliem Camp, 1700 m, December 9, 1938. One specimen. Belongs to the 
T. glenias group. The genitalia of the unique specimen are partially 
damaged. 
