IN DEFENSIVE COLORATION 363 



the hypothesis of Natural Selection, but on no alternative 

 hypothesis that has been proposed. It is not necessary 

 to refer further to the origin of Mimicry by means of 

 Natural Selection, but before proceeding to the discussion 

 of examples certain additional aspects of the subject may 

 be considered. 



It is of the utmost importance to realize that in the 

 aspects of the subject discussed in the following five 

 Sections, and probably even in the sixth, there is nothing 

 necessarily characteristic of Batesian as opposed to 

 MiiUerian Mimicry. The dominant importance of 

 instinct — inferences as to past history and migration — the 

 confirmation of a history inferred from Mimicry by the 

 study of structure — Mimetic Resemblance independent 

 of size ; all these are just as applicable to examples 

 of one kind of Mimicry as of the other. The remark- 

 able examples mentioned in Sections 7 and 8 require 

 consideration on their own merits, and oftentimes the 

 accumulation of further evidence, before they can be 

 allotted their final place in either category. 



3. The A 11- Importance of Instinctive Attitudes and 

 \ Movements in the Attainment of Mimetic Resemblance. — 



The necessity of studying Mimetic Resemblance during 

 life and under entirely natural conditions, is convincingly 

 shown by the well-known Indian Longicorn beetle Glenea 

 pulchella. In the cabinet this insect appears as an obvious 

 Longicorn, but Mr. Leslie Andrewes found that in the 

 field it bears a striking resemblance to an Ichneumonid. 1 

 A similar observation was made upon the South African 

 Longicorn Nitocris nigricornis by Mr. C. N. Barker 

 It is also true of our British Wasp-beetle, Clytus arietis, 

 and of a very large proportion of the examples of 

 Mimicry generally. 3 It is as true of MiiUerian Resem- 

 blance as it is of Batesian Mimicry. 



4. History and Migration may be Inferred from 

 Mimicry. — Batesian Mimicry and MiiUerian Resemblance 

 may supply evidence of the former migrations and history 



1 Proc. Ent. Soc, Lond., 1904, p. vi. 2 Ibid., p. xxxiv. 



3 See also pp. 238, 239, 252, 253, 256 of the present volume. 



2 



