2 54 ENTOMOLOGISK TIDSKRIFT 1918. 



polymorphism is strikingly exhibited by the females, one set 

 of which resemble the males in form, with a variable paler 

 colouring; the others have a large spatulate tail to the hinder 

 wings and a distinct style of colouring, which causes them 

 closely to resemble P. Coon^, a species of which the sexes 

 are alike and inhabiting the same countries, but with which 

 they have no direct affinity. The tailless females exhibit 

 simple variability, scarcely two being found exactly alike 

 even in the same locality. The males of the island of Borneo 

 exhibit constant differences of the under surface, and may 

 therefore be distinguished as a local form, while the conti- 

 nental specimens, as a whole, offer such large and constant 

 differences from those of the islands that 1 am inclined to 

 separate them as a distinct species — P. Androgens, Cr. We 

 hawe here, therefoie, distinct species, local forms, polymorph- 

 ism, and simple variability, which seem to me to be dis- 

 tinct phenomena, but which have been hitherto all classed 

 together as varieties. I may mention that the fact of these 

 distinct forms being one species is doubtl\' proved. The 

 males, the tailed and tailless females, have all been bred 

 from a single group of the larvae, by Messrs. Payen and 

 Bocarmé, in Java, and I myself captured in Sumatra a male 

 P. Meimwii, L., and a tailed female P. Achates, Cr., »in 

 copula!»'^ 



Under rubriken Minncry säger WALLACE: »I need scar- 

 cely say that I entirely agree with Mr. Bates's explanation of 

 the causes which have led to one group of insects mimicking 

 another.»^ Därefter följer en förteckning på de mera bety- 

 dande mimicry-fallen bland papilionider. Ett av dessa utgör 

 ett vackert exempel på invecklad diuiorfi. Jag citerar åter:^ 

 »The first (Papilio paradoxa och Euplœa Midamns) is a very 

 interesting case, because the male and female differ consider- 

 ably, and each mimics the corresponding sex of the Eu- 

 plsea.» 



Det framgår av ovanstående, att polymorfien i allmänhet 



' Pharmacopliaffi/s, Haash. 

 •' S. 6. 



■'' S. IQ. 

 ' S. 20. 



