Pcvpilio dardanus {nicropc) and Acriea johnstoni. 295 



jilcincmoidcs and a tropkonins of the western or mcropc 

 type.* The latter strongly preponderates : the hind-wings 

 are entirely those of troplionius. The fore-wings exhibit 

 the fulvous area oi 'plancmoides spreading inwards along the 

 inner margin and there becoming continuous with the 

 fulvous area of troplwnms. The pattern of the fore-wing 

 is very like that represented on Plate XX, Fig. 3, but the 

 fulvous area is somewhat larger and much less invaded by 

 dark ground colour. The apical half of the fore-wing is 

 typical plancmoidcs, closely resembling that of the figure 

 just quoted. This specimen taken alone would suggest 

 the origin oi planemoides from troplionius. 



(8) Intermediates between planemoidesawf? other mimetic 

 ^emale forms of dardanus, oiot ancestral hut due to first 

 crosses het'ween female of one form and male representing 

 another form. 



The three intermediate examples described above 

 (a, /3, and y) suggest the origin oi pilanemoides from the fully 

 developed eeneajiippocoon and ^rcj^Aom-z^s respectively ; and 

 yet it is unreasonable to suppose that j^lanemoides arose from 

 more than one of the other female forms. We are thus 

 driven to believe that such intermediates are not necessarily 

 ancestral and to inquire what other significance they may 

 possess. Here we derive the greatest assistance from Mr. 

 G. F. Leigh's breeding experiment in which it has been seen 

 (see pp. 283, 313) that the cenea offspring of a trojjhonius 

 parent exhibited distinct traces of the latter form. It will 

 be remembered that this influence was evident in the 

 deeper tint of the hind-wing patch in one specimen (Plate 

 XVII, Fig. 8) and the inner marghial markings on the fore- 

 wing of another (Fig. ll).t The intermediates described 

 in this section of the paper are probably always the result 

 of first crosses between females of one form and males bear- 

 ing the tendencies of other female forms. We are compelled 

 to believe that in later generations their female offspring 



* Easily distinguished from the tvophonvis of the south and east 

 by its greater size, by the marked invasion of the margin of the 

 fulvous area on the liind-wing by internervular radii, and by the 

 much paler shade of the fulvous areas. 



t A faint trace of the same marking is to be seen in the cenea 

 offspring of a trophonivs bred by Mr. Leigh in 1903. It can be 

 just detected in the reduced representation on Fig. 11, Plate XXXI, 

 Trans. Ent. Soc. London, 1904. 



