556 Appendix to Eev. K. St. Aubyn Rogers' Bionomic 



This remarkable and most interesting form of the highly 

 polymorphic $ of the tihidlus sub-species of P. dardanus 

 is in the Hope Department, and has been most kindly en- 

 trusted to me for description by Prof. Poulton. This, the 

 type of the new form, bears the following,' record : — " 1893, 

 Nairobi. C. F. Elliot captd. Pres. 1906"; and it was pre- 

 sented to the Hope Department by Mr. E. A. Elliott, F.E.S., 

 brother of the captor. It quite unmistakably mimics 

 the dorijfp 11 s-ioxni of Danais chrysippus so numerous in 

 British East Africa. One was led to expect as not 

 improbable the discovery of such a form of the $ Papilio 

 from the fact that in all the continental- African races of 

 P. dardanus in which the trophoni us- form of $ occurs a 

 variation has been met with presenting a partly or wholly 

 fulvous instead of white sub-apical bar in the fore-wing, 

 and so in some measure approximating to the D. doripjms 

 coloration.* But the non-existence in Western and great 

 rarity in Southern Africa of the dorippus-ioxva. of D. chry- 

 sippus rendered it very unlikely that the % Papilio in 

 those regions would include any close mimicry of that 

 form, and induced the surmise that if this mimicry did 

 exist, it would be found in that part of the Papilio s range 

 where the dorippns-'ioww equalled or exceeded in number 

 the typical form of B. chrysippus. This view has now 

 been verified by the discovery in British East Africa of 

 the $ Papyilio above described, in which the likeness to 

 dorippus is gained by the extension and continence of all 

 the rufous-fulvous areas and minor markings, and the con- 

 sequent diminution and suppression of the ordinary fuscous 

 ground colour. 



While it is observable that this likeness is not nearly 

 so exact — especially in respect of the under side — as that 

 exhibited by the $ Diadcma {Hypolimnas) misipp)ns, Lirm., 

 yet the fulvous tint is so very close to that of doripiais 

 from the same district, and has so far invaded and occu- 

 pied the hind-marginal borders, that the mimetic effect 

 in life must be great. The resemblance to dorippus is in 

 the example under notice so very much more advanced 

 than in any other specimen of the % Papilio known to me, 

 that it would not be surprising if individuals still more 

 accurately resembling the model should be found to exist 



* See my note on this point as regards the Western and Soutliern 

 races of ihtFapilio in"8. Afr. Butt.,"iii, p. 252 (1889). Cf.Poulton, 

 Trans. Ent. See. Lend., 1906, p. 290. 



