96 Dr. G. D. H. Caxpenter ow Pseudacraea eurylus Uohleyi. 



abundance of Planema there, as compared with Bugalla, 

 where, for example, I never found the plant which I knew 

 to be the food of P. poggei. But it is difficult to imagine 

 that in four years the food-plants had all become scarce 

 enough on Kome to cause so great a diminution in the 

 numbers of Planeyna. It is more likely that parasitic 

 enemies are the cause of waves of prosperity and decline 

 as is known to be the case with so many species; an 

 abundance of hosts one year produces an abundance of 

 parasites which destroy so many hosts that they in turn 

 diminish in luimbers, after which the host again increases. 



In conclusion I should like to express my great regret 

 that the late Colonel Manders, who so strongly criticised 

 my first paper, is no longer here to see the results of 

 further investigation of these interesting Pseudacraea. 

 One feels that his doubts as to the correctness of the 

 explanation of mimicry by natural selection would have 

 been still further shaken by the new facts brought forward 

 in this paper. 



I am indebted to my kind friend a)id mentor Prof. 

 Poulton for much helpful advice in the preparation of the 

 paper : the arrangement of the specimens for reproduction 

 is due to him and Dr. S. A. Neave, to whom I am much 

 indebted. 



Explanation of Plate II. 



Model sjjecies of Planema on the left; mimetic forms of Pseud- 

 acraea eurytus on the right, each opposite to its model. All hgures 

 are ;^ natural size. 



Ficf. 1. P.teUus,'^. Kome Isle. 12.viii.l914. Caught by " boy " 

 at edge of forest. 



2. Ps. eurytus f. terra, $. Damba Isle. 1-I5.ix.l911. In 



jungle, east side. 



3. P. epaea paragea, $. Bugalla Isle. 24.ii.1912. 



4. Ps. eurytus f. obscura, 9- Bugalla Isle. 18.ii.l912. 



5. P. macarista, 3*. Entebbe. 15.viii.l910. Caught by one 



of Dr. Wiggins' " boys." 



6. Ps. eurytus f. Jwbleyi, S. Wema Isle. I.iii.l918. In 



jungle on south shore. 



7. P. macarista, $. Kome Isle. 29.vi.191i. Edge of forest. 



