310 
LEUCOMA. By Dr. E. Strand. 
gigantea. 
comma. 
subvitrea. 
semih yali- 
na. 
singaporen- 
sis. 
riguata. 
pulverulen- 
ta. 
geometrica. 
submargi- 
nata. 
transiens. 
hipparia. 
L. gigantea Auriv. from Java deviates from subvitrea Wkr. (39 b) by its much larger size (expanse 
of wings: 61 mm), and by black markings of the frons, palpi and legs: frons with 2 black dots, palpi with black 
tips, the 1st and 2nd pairs of legs with a subbasal tibial spot, and the basal half of the first tarsal joint black. 
L. comma Hutt. S'- purely lustrous white; frons, palpi and anterior hips orange, anterior and middle 
tibiae with a black spot. Forewing with a black, comma-shaped discocellular moon-spot. Antennal pinnae 
brownish. Expanse of wings: 42 mm. Dehra-Dun, Nilgiris, Masuri. 
L. subvitrea Wkr. (39 b). $: purely white. Forewings almost without scales; the few scales present 
are hair-like, and the membrane is iridescent; in the living imago the veins are apple-green. Expanse of wings: 
38 to 42 mm. — Larva and pupa black (comp. Ind. Mus. Notes V. T. 22, h. 4 a and b). Food-plant: Terminalia 
catappa L. and perhaps others. Hongkong, Formosa, India (Ceylon, Bengal). 
L. semihyalina Sivinh. (39 c). S'- purely white, very scantily scaled, the wings lustrous and as hyaline 
as in L. silhetica Wkr. (39 a). Costa of the forewing slightly ochreous, the discocellular spot black. Antennae 
hued ochreous. Expanse of wings: 29% mm. Padang (Sumatra). — The veins 4 and 5 of the forewing are 
farther remote than is usual in this genus, and the veins 6 and 7 of the hindwing rise on a long footstalk. 
L. singaporensis spec. nov. (39 b). S'- resembles L. semihyalina Swinh. (39 c), the veins of the wings 
being similar, too. From L. subvitrea Wkr. (39 b) it deviates by its different size, the wings being not at all 
,,almost unsealed 41 , etc.; from L. transiens Wkr. it particularly differs by the entire absence of the discocellular 
spot. The whole insect is white, except a faint greenish hue in the forewing, particularly recognizable at and 
on the veins, so that only the costal margin of the forewing and the fringes of both wings appear purely white 
on a dorsal view. Antennal pinnae somewhat greyish. Palpi brownish-yellow, frons, vertex and collar greyish. 
It is open to doubt whether the abdomen is purely white in fresh specimens, since the two specimens before 
me appear somewhat oily on the abdomen. Expanse of wings: 27, length of forewings 14, length of body 
11 mm. Singapore (Coll. Seitz). 
L. riguata Snell. S and $ as L. submarginata Btlr. (39 b), but the forewdng all over with undulate, 
silvery or satiny white lines, and the distal margin of both wings hued grey, the most so beneath, where the 
grey is dentate towards the base in the $. Otherwise the animal is all white; the forewing shows a black central 
dot, the tibiae and the face are hued grey, the antennae grey with a white shaft, the legs without black dots. 
27 to 40 mm. Deli (Sumatra); Java. 
L. pulverulenta Snell, belongs to Section II of Hampson’s Fauna of Brit. India. Palpi, head, thorax, 
and wings above light yellow, the face, antennal shaft, collar and costal margin of the forewing purely white. 
Forewing thinly and uniformly strewn with dark scales being blackish towards the costal margin, otherwise 
dark brown. Central dot fine, black. The costal-marginal half and the posterior margin as far as vein 1 b on 
the hindwing are white, very thinly scaled, almost diaphanous, otherwise like the forewing. Fringes darker 
light brown. Wings beneath white, fringes hued brown. Abdomen brownish. Legs white, outside brownish. 
34 to 43 mm. Deli (Sumatra); Java. 
L. geometrica Semp. (39 b). S'- forewing on both sides pale yellow, with a black discocellular dot 
and a brown spot right behind the apex of the wing. Hindwing still paler yellow. All the fringes brown. Length 
of wings: 17 mm. South Mindanao, in January. 
L. submarginata Wkr. (39 b). White with brownish palpi and antennae and black-spotted legs. Fore¬ 
wing silvery lustrous with a yellowish costa at the apex, brownish fringes and a black cell-spot. Expanse of 
wings: S' 42, $ 50 mm. India, Ceylon, Burma, Java. — transiens Wkr. (39 c) may be distinguished as a side- 
form. S'- purely white. Head fawn-coloured with a white band in front. Forelegs with black and ochreous 
spots. Wings partly with lustrous white scales; fringes with a very faint fawny hue. Forewing with a black 
dot at the cell-end; the costal margin ochreous. Length of body: 12.2 mm. Expanse of wings: 28% mm. 
Walker himself supposes this form to be a variety of submarginata from which it differs by the ochreous costal 
margin. Sarawak. According to Semper’ s figure the insect would be white, in the forewing} with a round, black 
discocellular spot and extremely fine, black, transverse undulate lines, which, on a cursory view, are not con¬ 
spicuous at all. All the wings with darker fringes. Length of wings: S 17 to 19, $ 17 to 20 mm. Flies 
from November till February, in May and July not rare in the Philippines. Mentioned also from Perak and 
North Queensland. Specimens, well corresponding with Walker’s description, are before me from Kuranda 
in Queensland. —- hipparia Swinh. is presumably also a collateral form of submarginata. S'- purely white, wings 
thinly scaled, forewing with a small black discocellular spot, the whole upper surface of both wings appearing 
