340 THE PLACE OF MIMICRY 



a Batesian mimic. The same argument holds with greater 

 force for the allied Precis antilope in which the resemblance 

 to an Acraea is still more imperfect. 



It will be of interest at this point to exhibit in a tabular 

 form some of the remarkable series of appearances which 

 the wet forms may display in relation to the dry in the 

 great genus Precis (including Junonia). 



S. African habitat Species of the Character of Under Surface of Wings : 

 of Species. Genus Precis. Dry season. ]Vet season. 



(Precis lugela Procryptic Procryptic 

 Forest \ elgtva 



natalica {Directive marks (eye- 



Woodland and Open archesia \ Far less well concealed 



Open, Swampy (in l \ than the dry forms. 



Mashonaland) " cer y m " f Archesia I believe to 



( " actia J be Aposematic. 

 Woodland 



I 3 anhkpe Very conspicuous ; 



Woodland and Open * sesamus roughly mimetic of an 



J Acraea type. 



The types of country alluded to in the table are as 

 follows : Forest, with heavy timber affording deep 

 shade ; Woodland, without timber, trees small, affording 

 light shade ; Open, nothing higher than small scrub. 5 



The discovery of the nature of the physiological 

 stimulus determining the two forms of Precis is a most 

 interesting problem, to which Mr. Marshall has devoted 

 an immense amount of labour. The outcome of his 

 splendid investigations under most difficult conditions is 

 not yet published, and therefore I will only say that the 

 results exhibit much that is puzzling and contradictor)-. 

 As bearing upon the problem, it may be stated that the wet 



1 Dry form bred from wet by Marshall in 1 905 : Proc. Ent. Soc., Lond., 

 1906, p. Ivii. 



2 Dry form bred from wet by Marshall in 1903 : Proc. Eni. Soc., Lond., 

 1903, p. xxxii. 



9 Dry form bred from wet by Marshall in 1902: Trans. Ent. Soc., 

 Lond., 1902, pp. 418-20. 



4 Dry form bred from wet by Marshall in 1898 : Ann. Mag. Nat. 

 Hist., ser. 7, vol. ii, July 1898, p. 30. 



8 Trans. Ent. Soc., Lond., 1902, pp. 422-3. 



