56 Dr. A. G. Butler on the Old-World Celcemrrhinus mokeezi, Wallengr. Barberton (HarrisoJi), Zoutpaasberg (Kcessner). Tagiadesjiesus, Fabr. Bavbertou (Harrison). Rhopalocampta forestan, Cram. Pretoria (April). pisistratus, Fabr. Pretoria (Jan , Feb., April, Nov., Dec). Recorded elsewhere. Cyclopides maJgacha, Boisd. Potchefstroom [Triinen, S. A. liutt.). ccgipan, Trim. Ljdenburg District „ vietiinx, Trim. Potchefstroom „ Pi/rgus transvaalicc, Trim. Potcliefstroom „ mohozutza, ^^'alleuo•r. Lydenburg District „ Thymt'Iicus lepemda, Wallengr. Potchefstroom „ harhenv, Trim. No special locality „ Tamijliila Morantii, Trim. Upper Limpopo „ moritili, Wallengr. Lydenburg District „ Ayresii, Trim. „ „ Ahantis venosa, Trim. Barberton „ Oiprona canojms, Trim. Potchefstroom „ rmnjMla horbonica, Boisd. ( Walletigren, Insecta Transvaaliensia.) Steropes moiiochromns, Mab. (Soc. Ent. de Belg. 1891 , p. Ixiv.) Pamphila icteriu, Mab. (Soc. Ent. de Belg. 1891, p. clxxx.) Sape pertusa, Mab. (Soc. Ent. de Belg. 1891, p. Ixviii.) IX. — A Revision of the Pierine Butterflies of the Genus Terias from the Old World. By Arthur G. Butler, Pli.U., F.L.S., F.Z.S., &c., Senior Assistant -Keeper, Zoological Department, British Museum. The genus Terias has always been a puzzle to Lepiclopterists and probably will never be thoroughly understood until the whole of the species have been reared from the e^g through-out the year and in all parts of the world wliere they exist. At the same time, the careful labelling and dating of col-lections in recent years and the study which has been devoted to this genus in India and Africa have thrown considerable light upon the relationship of the numerous forms which, even in my "Notes on the Genus Terias " (Ann. & Mag. Nat. Hist. ser. 5, vol. xvii. pp. 212-225), I was obliged to regard, for want of evidence to the contrary, as distinct species. The rcsearclies of Capt. E. Y. Watson, C. W. Barker, and G. A. K. Marshall have conclusively proved that many of the supposed species of the genus are either seasonal or varietal : the wet-season forms having the under surface of the wings white or yellow, usually with somewhat feeble markings, or even none at all; the dry-season forms either reddish in colour*, sometimes with ill-defiucd markings, or
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