204 SOUTII-AFEICAX BUTTERFLIES. 



three transverse rovss of siih-vietallic or glisicning dark-edged spots. Forc- 

 vjing : orange-yellow field very pale, whitish, towards inner margin ; black 

 spots as in Pierus, Cram., but their silvery- white centres more metallic, 

 and those of the suhmargimd row also hcarioig a siherg- white dot on their 

 inward side. Hind-iving : spots smaller than in Fierus, those near 

 base and in row before middle similarly disposed ; but those of discal 

 row all separate, not forming an almost continuous streak, and with 

 the third spot from costa (between second subcostal and radial nervules) 

 out of line with and nearer base than the rest, and the three lower spots 

 not inclining towards anal angle ; an additional row of similar spots 

 midway hetiveen discal row and hind-margin, sinuated similarly, hut 'not 

 quite parallel to the former. 



$ Based suffusion more tinged nnth yellow ; orange-yellow varying in 

 extent from hcing Utile more dcvclop)cd than in $ to presenting a hroad 

 discal field miLeh as in Fieriis, though of a pedcr and duller tint. Fore- 

 wing : orange-yellow either entire from outer part of basal suffusion, or 

 narrowly, broadly, or very broadly divided into two by the ground- 

 colour on mediaji nervules. Hbid-wing : orange-yellow always better 

 developed than in ^, sometimes merging into basal suffusion, its outer 

 edge strongly indented by fuscous, which sometimes forms separate 

 inter-nervular spots. Under side. — As in ^, but the spots of hind- 

 wing less metallic ; the hind-marginal fuscous spots better defined, 

 especially in hind-wing. 



The characters italicised above seem constantly to distinguish this form 

 from Pierus, — the principal ones being, on the under side, the sniallness and 

 separateness of the spots of the discal row and the presence of an outer row of 

 spots besides the latter in the hind-Avings, and the more or less conspicuous 

 silvery-wliite dots marking inwardly the black spots of the submarginal row in 

 the fore-wings. Usually Tddiosama is smaller than Pierus, but two or three 

 females from the upper districts of Natal, in which the upper-side orange, 

 though dull in tint, occupies a wider space than usual, are quite as large. 

 Much resembling these 9 s is a (J from Zululand of unusually large size, with 

 the upper side orange, though paler, developed quite as largely as in Almeida, 

 Feld. 



This form seems peculiar to the interior of South Africa, where it Las 

 evidently a considerable range. It was first brought prominently to my notice 

 as probably separable from Pierus by a long series of specimens taken in 

 Basutoland by Colonel Bowker ; and Mr. W. Morant subsequently sent nie 

 several examples from Natal, the Orange Free State, and the Transvaal, all 

 taken in September and October 1870. 



Localities of Zeritis TaVioscmia. 



I. South Africa. 



B. Cape Colony. 



h. Eastern Districts. — Burghersdorp, Albert District (D. R. Ivanne- 



meyer). 

 d. Basutoland. — Koesberg, Maseru, and Maluti Mountains (/. //. 



Pou:l-er). 



C. Orange Free State. — Hebron, between Caledon and Orange Rivers 



('if. Morant). 



