114 Mr. H. Eltringham's Monogrcqili of the 



the ^ , the subapical band of the f.-\v. is white, slightly suffused 

 proximally, witli pale ochre yellow. The underside is typical. 



A. cephetis $ f. nigrescens, f. no v. 



This form represented in the Tring Museum has all the wings 

 sepia, without the white subapical bar. In the h.-w. the ex- 

 ternal portion of the discal area is jjaler and is deeply invaded 

 on the nervules by the black of the marginal border, and be- 

 tween them by the dark ground-colour. The spots are as in the 

 typical ^. On the underside the f.-w. is deep mauve, the costa, 

 apex, and hind margin sage green. H.-w. pale sage green. 

 Spots and markings as in typical examples. (Described from a 

 Sierra Leone specimen.) 



A series of ^ e.xamples shows various intermediates 

 between these different forms, often from the same locality. 

 Thus specimens from Fernan Vas R. (French Congo) 

 sliow all gradations from the typical $ to the phe^isaca 

 form, a $ from the same locality being of the usual color- 

 ation. I do not feel justified therefore in assigning any 

 particular $ to a distinctive form of $. One is tempted 

 to regard these different forms of $ as to some extent 

 seasonal, but the series here mentioned were all taken at 

 the same time, viz. in the month of January, which seems 

 to preclude this possibility. 



38. ACRAEA PETRAEA. PI. Vlll, f. 13. PI. XVI, f. 4. 



Acraea j^etraea, P)oisduval, Voy. Deleg., 2, p. 589 (1847) ; 

 Wallengren, Ehop. Caffr., p. 21 (1857) ; Hoppfer, Peters 

 Reise. Ins., p. 373, pi. 34 f. 1-4 (1862); Trimen, Rhop. 

 Af., Austr. p. 100 (1862); Oberthiir, Etud. d'Ent., 3, p. 26, 

 pi. 2, f. 4 (1878); Staudinger, Exot. Schmett, 1, p. 85, 

 pi. 33 (1885) ; Trimen, S. Af. Butt., 1, i>. 144 (1887) : 

 (metam.), I. c, -p. 145 ; Butler, Proc. Zool. Soc, p. 192 

 (1898) ; Aurivillius, Ehop. Aeth., p. 95 (1898) ; Fawcett 

 (metam.), Trans. Zool. Soc, p. 294, pi. 4G. f. 1, 2, 3 (1901); 

 Marshall, Trans. Eut. Soc, p. 325 (1902) ; Dixey & Longstatf, 

 Trans. Ent. Soc, p. 318, 328 (1907). 

 5 (dry season) = petrina, Suffert, Iris, p. 25 (1904). 

 Natal ; Transvaal ; E. Griqualand ; German E. Africa 



(Dar-es-Salaam, Kilimandjaro, Tanganyika, Mikandani). 



f. taborana, Suffert, Iris, p. 26 (1904). 

 Localities as above. 



