Fajnlio dardciTMS (iiicropc) and Acrxa j'ohnstoni. 305 



a narrow margin widened at the ajDex of the fore-wing 

 (Plate XXI, Fig. 4a). The whole of the rest of tlie surface 

 of both wings is bright fulvous, with the four spots of the 

 ibre-wing and the squarish patch of the liind-wing visible 

 (especially the former) as a paler shade of the same 

 colour. At a little distance and during flight these mark- 

 ings would become inconspicuous, and the butterfly would 

 closely resemble a small specimen of the form of Limnas 

 chrysipints dominant in British East Africa, viz. the dori'ppus 

 form ( = Idugii), without the black and white apex to the 

 fore-wing (Plate XXI, Fig. 4). On the under-side the 

 resemblance of fulvescens to the primary model is less 

 close because of the absence of the distinct black margin 

 so conspicuous on the upper-side. But this very appear- 

 ance, together with a radially striped pattern caused by 

 the alternation of dark veins and brighter ground colour, 

 and the increased paleness of the marginal part of the 

 hind-wing and the apical area of the fore-wing, promote 

 a deuterosynaposematic resemblance to another Acrseine 

 mimetic of dorippus, — the daira form of Acr^ca cnccdon. 

 These two Acr^as are moreover of nearly the same size, 

 while the Danaine primary model is of course a far larger 

 butterfly. The chief basal spots of the hind-Aving under-side 

 are not black and prominent but dark fulvous and there- 

 fore inconspicuous, in this case producing an appearance 

 suggestive of dorippus, and unlike any of the forms of 

 cnccdon in which the black spots are so conspicuous a 

 feature. 



II. AcTcVa j'ohnstoni, Godm., and A./cdlax, Rogenh., the 

 eastern forms of A. l//coci, Godt. 



The three forms which it is here proposed to unite under 

 a single species are thus grouped by Aurivillius : * — 



" 109. Acrsea johnstoni, Gbdm, ; tckhiana, Rogenh. ; ful- 

 vescens, Oberth, ; semifukcsccns, Oberth. : ab. Octobalia, 

 Karsch. ; ab. (et var.) confusa, Rogenh. ; johnstoni, Butl. ; 

 p)roteincc, Oberth. ; flavcscens, Oberth. ; sc7iiialhcscens, Oberth. 



"110. A. fallax, Rogenh., forma pnecedentis ? ; Kili- 

 mandjara, Oberth. 



"111. A. lycoa, God.; ab. $ Butleri, n. ab. lycoa, var. 

 ? Butl." 



* Rhop. ^Etliiop. 1898, pp. 114, 115. References are omitted 

 from the quotation. The italics indicate synonyms. 



