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Show 1897.] BUTTERFLIES OF THE GENUS TERACOLUS. 21 apical patch, which is generally present in that species, but is very variable in size aud sometimes absent. T. lone, Trim, (part), and T. jalone var. natalensis, Staud., represent the Natal form of the species, which differs from T. Imperator in its smaller size, the absence of the 6th spot in apical patch, and the rather stronger development of the inner black edging of the purple; but specimens from Mashunaland and the Transvaal show every intergrade between the two forms. In the quasi-tropical coast-belt of Natal another variation occurs, in which the purple patch is slightly reduced owing to the broadening of the inner black edging, and the ends of nervules on the underside of hind wings are strongly blackened, often terminating in spots on the hind margin. T. buxtoni is the normal dry-season form of the species in South Africa, the Central-African specimens being noticeably larger. Although the males of this species are so variable, the females are even worse and the variations are not so localized. Not only does the ground-colour vary from white to bright yellow, but even the discal black markings are apt to be very much reduced, and the apical patch may be either red or black ; in the latter case it contains a row of small spots, which may be either white, yellow, or red. The tints of the underside also vary much, and there seems to be a sporadic tendency to blackening of nervules. T. phlegyas ranges thoughout East Africa from Natal to Abyssinia, and in the Southern Tropic it extends westwards to Damaraland and Ovampoland. 39. TERACOLUS REGINA. Anthocharis regina, Trimen, Trans. Ent. Soc. p. 520 (1863). Callosune anax, H . G. Smith, Ann. Mag. N . H . (6) iii. p. 125 (1889). Teracolus ellza, Sharpe, Ann. Mag. N . H . (6) v. p. 441 (1890). This handsome species, which is wonderfully constant, has not quite such a wide range as T. phlegyas. On the eastern side its southern limit seems to be about 28° S. lat., and it has not been recorded north of Victoria Nyanza ; from the Transvaal it ranges west through Bechuanaland to Damaraland. The species was founded on dry-season specimens; T. anax, with which T. ellza is identical, being the wet-season form. 40. TERACOLUS DUCISSA. Ptychopteryx ? ducissa, Dognin, Le Natural, p. 132 (1891). Founded on a single specimen from Zanguebar, apparently the only one recorded. Judging by the description, this must be a very distinct species :-" Breadth 55 m m . Upperside white ; apical third of fore wings orange-red, bordered exteriorly with brick-brown, the latter colour extending to inner angle. Underside of hind wings yellowish with reddish striolae and traversed on disc by a straight, well-defined, reddish-yellow ray." The extension of the hind-marginal border in fore wing is noticeable. The |