For instance, it might have been predicted from the theory alone that an immune species would often have several mimics, as, in point of fact, is frequently the case, and it would be easy to give numerous examples of this. Thus the two Danaids of South and Central Africa, _Amauris echeria_ and _Amauris niavius_, are mimicked, not only by the two female forms of _Papilio merope_, as we have already described in detail, but the latter is also mimicked by Nymphalid, which requires protection, _Diadema anthedon_, and the former by two diurnal butterflies of different families, _Diadema nuina_ and _Papilio echerioides_. Similarly, the black-and-red coloured _Heliconius melpomene_ in Brazil is mimicked both by the female of a White (_Archonias teuthamis_), and by a _Papilio_, which has received the name of _P. euterpinus_ on account of this resemblance. Thus, too, the immune _Methona psidii_, Cr. of Brazil, with its half-transparent wings marked with black bands, has five mimics, belonging to five different genera, and one of these is not a true diurnal butterfly at all, but one of the day-flying species of the genus _Castnia_, whose systematic position is doubtful. [Illustration: FIG. 18. Upper surfaces of _A_, _Acræa egina_, from the Gold Coast, immune. _B_, _Papilio ridleyanus_, from Gaboon, not immune. _C_, _Pseudacræa boisduvalii_, from the Gold Coast, not immune.] The West African immune Acræid, _Acræa gea_ (Pl. II, Fig. 21), is deceptively mimicked, both as to the narrow, long shape of the wing and its blackish-brown and white mottled markings, by a Nymphalid, _Pseudacræa hirce_, by the female of a Papilio (_P. cynorta_) whose mate is quite different, and by the female of a Satyrid (_Elymnias phegea_) (Pl. II, Fig. 20). In the _Papilio_ the resemblance extends to the peculiar pitch-black shining spot on the under side of the base of the posterior wing, and all three are like the model on both surfaces, and therefore in flight as well as in the resting attitude. On the same West African coast occurs the strange greyish-black _Acræa egina_, with brick-red spots and bands, and coal-black dots (Fig. 18, _A_). This immune species is deceptively mimicked in its native country by two other butterflies--a Nymphalid, _Pseudacræa boisduvalii_ (Fig. 18, _C_), and by a female _Papilio_ (_P. ridleyanus_) (Fig. 18, _B_), by the latter not so exactly as by the former, but quite sufficiently to be confused with its model in flight. It would have been less easy to predict with certainty from the theory that, conversely, the different species of a genus which stood in need of protection would be able to mimic quite different immune models, for who would have ventured to prophesy how far the capacity of a species for variation might go, and how many different kinds of coloration it was able to assume? But the facts teach us that there is a wide range of possibility in this respect.