Two species of the Oriental Euthaliini, Symphaedra nais and Euthalia evelina are illustrated, with descriptions of main specific characters, notes on geographic variations and bionomics. Figures of the male genitalia are also provided. Symphaedra nais, a peculiar butterfly somewhat resembling Byblia species of Byblinae, is here treated as belonging to the monotypic genus Symphaedra as by some other authors. The grounds are as follows: (1) The male genitalia are markedly specialized in having the gnathos ventrally not conjoined, with sharply pointed, brachium-like arms, and the juxta with unusually long processes. (2) Cilia are relatively long for the wing size and prominently checkered with black and white. (3) The reddish-ochreous ground colour and the scheme of black patterns are entirely different from those of other Euthaliini. (4) This species is a denizen of hot and dried waste land or semi-desert, while Euthalia species are essentially confined to humid forests. Euthalia evelina is here treated as the single representative of the subgenus Dophla or the evelina group. Systematically the species is not closely allied to other larger Euthalia species which mostly have closed forewing cells. Particularly, the Chinese or Himalayan group, e.g. E. thibetana, features a taller tegumen and differently formed gnathos. E. evelina may be placed near the E. lubentina group, as it has red patches on the head and wings and the male genitalia rather similar to those of the lubentina group.
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