FAM. GEOMETRIDJ/E 147 
species, as frotrusa, inaptaria, submacularía and. the viridaurea-group) offers usually a further distinction, 
as does also the nature of the c antennal pectinations; but it must be admitted that the two genera are 
not always very sharply defined. T/alerura, with the tail of hindwing on the whole more pronounced, 
we have found quite untenable. 
Type of the genus : Gelasma (hetydaria ((yuenée) — Iodis thetydaria, Guenée (1893). 
Geographical distribution of species. — Indo-Malayan Region (straggling into the Eastern 
Palearctic), Madagascar. 
1. G. thetydaría (Guenée). India, W. China, Philip- 
Iodis thetydaria, Guenée, Spec. Gén. Lép. Vol. 9, p. 358 (1858). 
T'halassodes bifasciata, Walker, List Lep. Ins. Brit. Mus. Vol. 26, p. 1562 
(1862). 
TAhalera bifasciata, Moore, Proc. Zool. Soc. Lond. p. 637 (1867). 
Gelasma thetydaria, Warren, ibidem, p. 352 (1893). 
. G. dissimulata (Walker). 
Thalassodes dissimulata, Walker, List Lep. Ins. Brit. Mus. Vol. 22, p. 551 
(1861). 
Thalerura marginata, Warren, Novit. Zool. Vol. r, p. 392 (1894. 
3. G. illiturata (Walker) (praec. var. ?). 
Thalassodes illiturata, Walker, List Lep. Ins. Brit. Mus. Vol. 26, p. 1563 
(1862). 
4. G. acutissima (Walker). 
Thalera acutissima, Walker, List Lep. Ins. Brit. Mus. Vol. 22, p.596 (1861). 
Thalassodes acutissima, Hampson, Fauna Ind. Moths, Vol. 3, p. 512 (1895). 
5. G. goniaria (Felder) (prec. var.?). India. 
Timandra goniaria, Felder, Reise Novara, Lep. Het. t. 128, f. 3 (1875). 
Thalera aculeata, Hampson, Ill. Het. Coll. Brit. Mus. Vol.8, p. 109, t. 150, 
f. 5 (1891). 
Thalerura goniaría, Swinhoe, Trans. Ent. Soc. Lond. p. 175 (1894). 
Thalassodes acutissima (part.), Hampson, Fauna Ind. Moths, Vol. 3. p. 512 
(1895) tnec Walker). 
6. G. veninotata (Warren) (praec. var. ?). 
pines. 
l2 
Borneo to N. India, Ceylon. 
E. China, Japan. 
Ceylon. 
Assam. 
Thalerura veninotata, Warren, Novit. Zool. Vol. 1. p. 678 (1894). 
7. G. inapíaria (Walker). N. India. 
Thalassodes inaptaria, Walker, List Lep. Ins. Brit. Mus. Vol. 26, p. 1560 
(1862). 
Thalassodes urapteraria, Walker, ibidem, Vol. 35, p. 1608 (1866). 
Thalerura urapteraria, Swinhoe, Trans. Ent. Soc. Lond. p. 175 (1894). 
Thalassodes inaptaria, Hampson, Fauna Ind. Moths, Vol. 3, p. 513 (1895). 
Thalerura inaptaria, Swinhoe, Lep. Het. Oxford Mus. Vol. 2, p. 403 (1900). 
8. G. glaucaria (Walker). N., India, Tibet. 
Thalera glaucaria, Walker, List Lep. Ins. Brit. Mus. Vol. 35, p. 1613 (1866). 
Thalassodes glaucaria. Butler, Ann. Mag. Nat. Hist. (5), Vol. 6, p. 215(1880). 
9. G. ambigua (Butler). 
Thalassodes ambigua, Butler, Ill. Het. Coll. Brit. Mus. Vol. 2, p. 49. t. 36, 
f. 6 (1878). 
Thalera ambigua, Leech, Ann. Mag. Nat. Hist. (6), Vol. 20, p. 244 (1897). 
IO. G. frotrusa (Butler). 
TThalera protrusa. Butler, Il. Het. Coll. Brit. Mus. Vol. 2, p. 50, t. 36, f. 10 
(1878). 
Ir. G. cowant (Butler). 
Japan. 
Japan, Amur. 
Madagascar. 
Thalera cowani, Butler, Ann. Mag. Nat. Hist. (5), Vol. 5, p. 390 (1880). 
Gelasma cowani, Swinhoe, Trans. Ent. Soc. Lond. p. 545 (1904). 
12. G. centrophylla (Meyrick). ' 
Iodis centrophylla, Meyrick, Proc. Linn. Soc. N. S. Wales (2). Vol. 2, p. 880 
(1888). 
Iodis angulata, Lucas, ibidem, Vol. 3, p. 1264 (1888). 
Prasinocyma centrophylla, 'Turner, ibidem, Vol. 35, p. 599 (1910). 
E. and S. E. Australia. 
