( xciii ) 

 Mr. Champion commented on the change of food-plant 

 illustrated by the latter exhibit. 



Rhopalocera from Fernando Po.-Dr. H. Eltringham 

 exhibited examples of Papilio dardanus <?, taken by Mr. G. H. 

 Bullock (British Vice-Consul at Fernando Po) near Santa 

 Isabel, Fernando Po, and kindly presented to the department, 

 and pointed out that in the fore-wing, the general line of the 

 inner edge of the black area was nearly straight. It was a 

 remarkable fact that this feature was essentially eastern and 

 ancestral, being characteristic of Madagascar and Ethiopian 

 forms, examples of which were shown, together with specimens 

 from other localities. In the latter the inner edge of the 

 black area was shown to be always markedly concave. Female 

 examples of dardanus received from the same locality were ot 

 the Uppocoon form, and the model Amauris mamus was ot 

 the typical pattern. 



Similar instances of the recurrence of certain eastern features 

 iu the extreme west were mentioned, notably the ? of Acraea 

 eaina subsp. medea, which was a black-and-white form closely 

 resembling A. egina ? f. alba found by Dr. Carpenter on Sesse 



S The exhibitor also showed a curious example of Danaida 

 chrysippus f. alcippus taken near S. Isabel, Fernando Po and 

 entirely devoid of yellow pigment, the result being that the 

 specimen had the appearance of a monochromatic representa- 

 tion of the insect. In his opinion it showed that two pigments 

 only exclusive of the white were nominally present in the 

 win^s the beautiful shades of yellow in the fore-wings being 

 duetto the varying density of the sepia pigment, precisely as 

 a shaded effect may be obtained in chromo-hthography 

 That the absence of yellow pigment was not due to contact 

 with chemical substances was shown from the following 

 extract from a letter from Mr. Bullock, in reply to inquiries 

 relating to the specimen. _ 



" I remember catching the grey Danaida chrysippus quite 

 well It was on a small shrub about twenty yards in front 

 of my house, I think a rose-tree, since removed. It was one 

 of the first butterflies I had caught; but I realised its different 

 colour before I caught it, and the colour has not changed 



