oj the Genus Teracolus, Swains. 453 



The yellow form of this species appears to be strictly con- 

 fined to Kaffraria and Natal, but a somewhat paler race occurs 

 in Matabeleland. The extreme types T. auxo and keiskamma 

 were proved by M~ansel Weale and recently by Mr. Marshall 

 to be wet- and dry-season forms of one species ; T. topha, 

 which is usually regarded as identical with T. keiskamma, 

 appears to me to be an intergrade of which we possess six 

 examples in the Museum. 



Of the Matabele type, which only differs in its somewhat 

 whiter coloration, we only possess males of the wet and 

 intermediate forms. 



28. Teracolus dissociatuSj sp. n. 



Allied to T. auxoj but with whitish or white ground-colour, 

 tinted along edge of apical area with sulphur-yellow. The 

 wet-season form differs also from that of T. auxo in that the 

 male has a black oblique bar bounding the inner edge of the 

 orange apical patch ; the intermediate form * chiefly differs 

 from T. topha in its white colouring and the much more 

 limited apical orange patch ; the dry -season form differs from 

 T. keiskamma in its white colouring and much darker borders, 

 but more especially in the females. In size this species 

 agrees in all its forms with the more southern butterfly. 



Ranges from Nyasaland northward by Kilima-njaro to the 

 Victoria Nyanza. 



29. Teracolus evarne. 



Pontia evame^ Klug, Symb. Phys. pi. vi. figs. 1-4 (1829). 

 Pontia liagore, Klug, L c. figs. 5-8 (1829). 

 Teracolus citreus, Butler, P. Z. S. 1876, p. 152. 

 Teracolus xanthevarne, Butler, t. c. p. 163. 

 Teracolus syrtinus, Butler, t. c. p. 163. 



One of the most widely distributed and variable species of 

 its group, ranging from Upper Egypt and the White .Nile to 

 Abyssinia, southwards to the Albert Nyanza, the Victoria 

 Nyanza, and Kilima-njaro, andeastwards to Mombasa. On the 

 western side it appears to be rare, but we have one example (the 

 type of T. syrtinus) said to be from " Senegal " and a second 

 recorded as simply from " West Africa." In ground-colour 

 T. evarne varies from primrose-yellow to white, the typical 

 form being almost white with yellow diffused bordering to 

 the orange apical area ; this is the wet-season form of the 

 species and the most heavily marked with black. T. xanih- 

 evarne appears to be the prevalent form of the species in 



* One of the supposed types of T. syrtinus referred to by Messrs. Triinen 

 and Marshall. 



