IV] NEW-WORLD MIMICS 43 



mimics are several forms belonging to the genus 

 Archonias (PI. XI, fig. 10) which exhibit the simple 

 and striking arrangement of black, red and white 

 so characteristic of the Swallow-tail Poison-eaters of 

 S. America. They form one of the rare instances of a 

 Pharmacophagus Papilio being mimicked by a butterfly 

 which does not belong to the Swallow-tail group. 



As everywhere in the tropics the Papilios of S. 

 America supply a goodly proportion of the mimicry 

 cases. A few, such as P. zagreus (PI. X, fig. 8), 

 enter into the black-brown and yellow Ithomiine- 

 HeHconine combination ; P. euterpinus resembles Heli- 

 conius melpomene (PI. XI, fig. 5) ; P. pausanias is like 

 Heliconius sulphurea (PI. XI, figs. 1 and 2). But this 

 practically exhausts the list of Papilios which mimic 

 Heliconines and Ithomiines. The great majority of 

 mimicking Swallow-tails in S. America find their models 

 among the Poison-eaters of their own family, offering 

 in this respect a contrast to those of Asia where the 

 majority of models are among the Danaines and 

 Euploeines, and of Africa where they are exclusively 

 Acraeines or Danaines. 



The Poison-eaters of S. America fall into two well- 

 marked groups which we may call the red-spotted 

 and the dark green groups respectively. The red 

 spotted group form a remarkably compact and 

 uniform assemblage. The general ground coloiu" is a 

 deep black-brown (PI. XI, figs. 8 and 9), the hind mngs 

 are almost invariably marked with red near the centre 

 or towards the outer margin, and the fore wing may 



