504 Rev. K. St. Aubyn Rogers' Bionoinic Notes on 



author in the same locality and on tlie same or nearly the 

 same date. The two Euralias are so much alike in pattern 

 that they might easily be mistaken even in the cabinet, 

 while their resemblance to the pattern of the Pseudacriea 

 is also very marked. There can be little doubt that this 

 is not an incidental result of resemblance to the same 

 Danaine model, but that it is a genuine case of secondary 

 mimicry. The most characteristic element in the pattern 

 of the Pseudacrma is a curved series of white spots crossing 

 the fore-wing and forminsj toijether a marking which 

 suggests a thick "comma," The concave side of the curve 

 is directed towards the base of the wing, and the point of 

 the " comma " rests in the cell. This well-marked feature 

 occupies nearly the position and is mimetic of the chief 

 white marking in the fore-wing of Amauris ochlca. It is, 

 however, of a more peculiar and characteristic shape in the 

 mimetic Pscudacra^a, and the two Euralias which resemble 

 it, than in the model. Hence there can be little doubt 

 about the existence of a true secondary approach between 

 these representatives of the two Nymphaline genera. 

 The question furthermore arises as to whether Psciidacrma 

 or Euralia has acted as the model. Although all three 

 species appear to be common in the neigiibourhood of 

 Rabai, it is probable that Pseudacrxa lucretia expansa is the 

 model followed by its Nymphaline co-mimics. The second- 

 ary resemblances described above are well shown in Figs. 

 4-6 of Plate XXVII. The peculiar marking, with some 

 modification, occurs in other sub-species of luo^etia, between 

 them covering a very wide range — in tarquinia, Trim., of 

 the south-east ; in the abundant form (with points of 

 resemblance to both tarquinia and cccpansa) from the N.E. 

 of the Victoria Nyanza ; and in lucretia lucretia of the 

 West Coast. The two Euralias have a far more limited 

 distribution, being apparently confined to areas where the 

 marking reaches its most characteristic development in the 

 Psettdacr/Ba. There is no doubt, as the author pointed out 

 to me, when we were studying the Hope Collection to- 

 gether, that the central markings in the fore-wing o^ Euralia, 

 duhitis, Pal. (neighbourhood of the Victoria Nyanza to the 

 W. Coast), tend to exhibit a peculiar curve which may 

 indicate affinity with E. dcccptor rather than the usually 

 accepted affinity with E. mima* Trim., but the relation- 



* Upon the under surface, Euralia duhiits ajDpears to resemble 

 K. mima niucli more closely than it does E. deceptvr and E. kirhyi. 



