52 
MICROLEPIDOBTERA OF NEW GUINEA 
except for the smooth head and the bright colours of the latter. The 
numerous, rather uniform species are not easy of discrimination. 
The colouring of head, palpi, abdomen and legs, and the genitalia 
in both sexes render sufficient specific characteristics. The' species are 
of smaller size than those of Zacorisca. The genus is confined to New 
Guinea. 
Besides the species recorded or described below, the following, formerly 
described species belong in this genus: 
Chresmarcha pythia Meyrick, 1920, Exot. Microl., vol. 2, p. 339 (Nether- 
lands South New Guinea: Snow Mountains, Setekwa River). 
Chresmarcha delia Meybick, 1924 , ibidem, vol. 3, p. 110 (British New 
Guinea: Owgarra). 
Zacorisca plicata Diakonoff, 1941, Treubia, vol. 18, p. 31, pi. 1, fig. 3, 
pi. 3, fig. 4 (Central North New Guinea: April River). 
Zacorisca spectabilis Diakonoff, 1914, ibidem, vol. hors serie, p. 37 — 38, 
figs. 5, 6 (Netherlands New Guinea: Wissel Lakes). 
Zacorisca capnoptera Diakonoff, 1944, tom. cit., p. 40, f. 3 (Netherlands 
New Guinea: Wissel Lakes). 
1 . 
2 . 
3. 
4. 
5. 
6 . 
8 . 
9. 
10 . 
Key to the known species of Chionothremma 
Ground colour of fore wing pure white or silvery-white 2 
Ground colour of fore wing not thus 21 
Fore wing without any markings 3 
Fore wing with marginal, terminal or apical black markings or with terminal 
third suffused with dark grey ; ■ • ® 
Head light citric-yellow or white with face and vertex suffused with yellow 
and reddish ^ 
Head entirely white pallescens spec. nov. 
Head, palpus and thorax light citric-yellow, basal segment of palpus fuscous; 
smaller species; 17 — 18 mm citrica/put spec. nov. 
Head whitish, upper half of face and vertex suffused with yellow and reddish, 
palpus pale yellow; larger species: 22.5—26 mm. . nivisperennis spec. nov. 
Fore wing snow-white, terminal third suffused with dark grey 
melanoleuca Diakonoff (part) 
Fore wing not thus ® 
Fore wing silvery-white, hind wing more or less suffused with dark grey 7 
Fore wing pure white, hind wing white, sometimes with terminal or apical 
black markings 
Head and palpus orange, or rather bright fulvous -ochreous 8 
Head and palpus pale yellow ® 
Legs blackish patarea Meybick 
Legs ochreous auripes spec. nov. 
Dark markings in fore wing and hind wing dark grey tinged fuscous; costal 
fold to beyond middle of costa, its edge convex throughout 
plicata Diakonoff 
Dark markings in fore wing pure black, hind wing more or less suffused with 
dark grey; costal fold shorter, mostly with edge concave posteriorly. . 10 
Hind w T ing distinctly much paler anteriorly ochricauda spec. nov. 
Hind wing rather evenly dark grey, sometimes only dorsum suffused with 
white 
11 
