TERACOLrS. 127 



Underside. — Very similar to that of tlie male (fig. la), excepting that the ground- 

 colour of the secondaries is pale yellow, instead of white. 



Expanse 1"4 inches. [Spec, ex Zeilu, Somali Land; June 4, 1895; Ciqjf. Nurse; 

 Mks. Brit) 



A second form of the female is very similar to the one fully described above, the 

 difterences being the sulphur-yellow ground-colour of both wings and the somewhat 

 narrower brownish-black apical ixxtch on the primaries. The underside does not 

 diflfer as regards the spots and markings, but the ground-colour is deeper yellow. 



Expanse 1"3 inches. {Spec, ex Zeila, Somali Land, May 28, 1895 ; Caj^t. Nurse ; 

 Mks. Brit. ; T. sfyyia) 



" Intermediate " form op Male. — Central area of the primaries creamy-white, 

 the orange-red apical patch broader, and extending over the black transverse band 

 towards the costal margin ; the dark line along the inner margin only indicated by 

 a faint dusky spot near the posterior angle. Secondaries with the hind-marginal 

 border somewhat narrower, and showing more white towards the anal angle. 



Underside. — Ground-colour of both wings more greenish-yellow; a blackish spot 

 strongly indicated near the posterior angle. Secondaries showing a distinct olive- 

 green line in place of the usual shading on the hind-margin, a spot of the same 

 colour being also visible near the end of the costal nervure. 



Expanse 1"3 inches. [Sjjec. ex Zarafe Biver, Wldfe Nile ; Capt. IL N. Dinin ; 

 Miis. Brit. ; T. stygia) 



"Intermediate" form of Female. — Excepting that the brownish-black markings 

 on both wings are much reduced in size, especially on the inner margin of the 

 primaries, specimens agree with fig. Id both on the upper and under surfiice. 



A second form has the ground-colour of both wings sulphur-yellow ; the 

 brownish-black apical patch on the primaries suffused with deep yellow on the inner 

 side; the dark line on the inner margin faintly indicated with reddish-buil'; the 

 nervules terminating in brownish spots on the hind margin, the apical spots being 

 the largest. 



Underside. — Central area yellowish-white, the base darker ; the orange band lined 

 on the apex and hind margin with yellowish-buff; a faint buff spot and line visible 

 along the inner margin. Secondaries entirely sandy-yellow ; the hind-marginal 

 border darker ; a faint reddish-buflf spot at the end of the costal nervure. 



Expanse 1'6 inches. {Spec, ex " Upper Eyypt" ; Consul Petheriek ; Mns. Brit.; 

 one of the types of T. xanthus, Smnhoe.) 



" Dry-season " form oe Male. — Primaries white, with a large orange-yellow 

 patch covering the whole of the apical area ; the nervules faintly streaked with 

 black on tlie hind margin, but not below the first median norvule, Secondaries 



