56 TERACOLUS. 



TERACOLUS BETTONI, Butler. 



(Plate 19, figs. 1, la-lh.) 



Teracolw phleyyas (pt.), Butler, P. Z. S. 1894, p. 574. 

 Teracolus bettoni, Butler, P. Z. S. 1898, p. 409. 



Male. — Differs from 2\ imperator in having the black sub-apical band on the 

 primaries much narrower and in some specimens nearly obsolete. The purple band 

 is also more metallic than in the allied form, the apex more thickly suffused with 

 grey. Secondaries with no black nervular spots on the hind-margin. 



Underside. — Entirely white, the apical area of the primaries pale yellow. Secon- 

 daries white, the transverse discal line only faintly indicated, the usual basal streak of 

 orange on the costal marginalso present. Expanse 2*5 inches. (Spec. ex. Tsavo 

 River, January; F. J. Jackson Coll.) 



Female. — Distinguished from that of T. imperator by the black at the base of the 

 primaries being thickly sprinkled with grey, and extending on the inner-margin in a 

 much narrower line ; a distinct brownish-black spot above the sub-median nervure and 

 nearer to the posterior angle ; the orange apical patch not so large as in T. imperator, 

 and more equally divided by the black post-median row of spots ; the white band 

 crossing the wing much broader than in T. imperator. Secondaries differing from 

 those of T. imperator by having no black on the costal margin or at the base, the 

 whole of the central area being white, the narrow line traversing the discal area 

 distinctly indicated, becoming somewhat broader towards the costal margin. 



Underside. — Primaries similar to those of T. imperator, the black at the base and on 

 the inner-margin smaller and not so heavily indicated ; the apical area more ochraceous. 

 Secondaries entirely pale ochre, with vermiculations of brown on the median nervular 

 area, the hind-marginal border violaceous, and the transverse discal band rufous-brown. 



Expanse 2"6 inches. (Spec. ex. Melindi, January ; Mus. Rothschild.) 



A female, which Dr. Butler considers to be an intermediate form (Plate 19, fig. Id), 

 is entirely sulphur-yellow, the orange apical patch smaller, and the black spot near 

 the posterior angle mucli reduced in size. Secondaries similar to the primaries, the 

 brownish-black hind-marginal border narrower, and the transverse band not so 

 strongly indicated. 



Underside. — Central area of the primaries sulphur-yellow, the dark spots and 

 markings similar to those of the females above described. Secondaries deep buffy- 

 yellow, deepening into russet-yellow on the hind-margin, the ground colour thickly 

 covered with brown vermiculations; the typical transverse line chestnut-brown. 

 Expanse 2"1 inches. (Spec. ex. Witu ; Mus. Rothschild.) 



