Contributions to the theory of natural selection. A series of essays ... By Alfred Russel Wallace ...

148 THE MALA YAN PAPILIONIDA AS
replaced by local forms or by closely allied species, occurs
in every island of the Archipelago) has convinced me
of the correctness of this statement; for in every place
where a male allied to P. Pammon is found, a female
resembling P. Polytes also occurs, and sometimes,
though less frequently than on the continent, another
female closely resembling the male: while not only has
no male specimen of P. Polytes yet been discovered,
but the female (Polytes) has never yet been found in
localities to which the male (Pammon) does not extend.
In this case, as in the last, distinct species, local forms,
and dimorphic specimens, have been confounded under
the common appellation of varieties.
But, besides the true P. Polytes, there are several
allied forms of females to be considered, namely, P.
Theseus (Cramer), P. Melanides (De Haan), P. Elyros
(G. R. Gray), and P. Romulus (Linnmaus). The dark
female figured by Cramer as P. Theseus seems to be
the common and perhaps the only form in Sumatra,
whereas in Java, Borneo, and Timor, along with males
quite identical with those of Sumatra, occur females
of the Polytes form, although a single specimen of
the true P. Theseus taken at Lombock would seem to
show that the two forms do occur together. In the
allied species found in the Philippine Islands (P. Alphenor, Cramer =P. Ledebouria, Eschscholtz, the
female of which is P. Elyros, G. R. Gray,) forms
corresponding to these extremes occur, along with a
number of intermediate varieties, as shown by a fine
series in the British Museum. We have here an