598 Mr. J. C. Moulton on some of the inincipal Mimetic 



the wings during flight or at rest with wings expanded, 

 the upper of these two is doubtless concealed and the 

 lower spot then probably represents that on the fore-wing 

 of the Mclinxa. The male Pierine Dismorphia egaena 

 (Fig. 6) bears a similar spot at the apex of the hind-wing, 

 and probably mimics the Hdiconius in this respect. The 

 Protogonius (Fig. 10), as before, is only a rough although 

 a most unmistakable mimic, and as in the previous asso- 

 ciations, the Lycorca (Fig. 1) appears to act as its principal 

 model, both species being conspicuous in the combination 

 for their hind-wing marginal spots and for the ochreous 

 markings of the fore-wing. 



The transition from this association to the next is prob- 

 ably in part preserved in a separate Peruvian association, 

 in which the mahogany ground colour has been replaced 

 by orange-fulvous ; the black bands of the hind-wung have 

 fused or half-fused, while the apical yellow markings in the 

 fore-wing are much reduced and wanting altogether in 

 some cases. Thus the three following Peruvian species 

 would be considered obvious members of the Ega associa- 

 tion except for the substitution of an orange-fulvous 

 ground colour for the Ega mahogany tint. These are 

 Ce7'atinia anastasia, Bates, a Peruvian form of Melinxa 

 'pardalis, Bates, and Heliconitisjioridus, Weym. All three 

 species possess both yellow apical and black hind-wing 

 marking.-^, which are very similar to those of the species 

 from Ega. A further stage in this transition is suggested 

 by two species of Melinxa {M. 'phasiana, But!., and M. 

 oresies, Salvin), and one Heliconius {H. arcuclla, Druce), in 

 all of which the yellow apical markings are wanting. 

 Except for this deficiency they resemble the former trio. 

 Tithorea cuparina, Bates, may represent the next step ; for 

 in it the apical region is black and free from all traces of 

 the mottled appearance. The black hind-wing, typical of 

 the next association, is not however found in this 2'ithorea, 

 wiiich still retains the black bar placed upon an orange- 

 tawny ground colour. 



These interesting transitional forms lead on to the last 

 Neotropical Association considered in this paper. 



i 



