On the phenomena of variation and geographical distribution as illustrated by the Papilionidæ of the Malayan region

by Alfred Russel Wallace

22. Papilio Neptunus, Guérin.

P. Neptunus, Guér. Deless. Voy. dans l’Inde, p. 69, t. 19 (P. Saturnus).

Hab. Malacca, Borneo (♂, ♀) (Wall.).

23. Papilio Coon, Fabricius.

P. Coon, Fab. Ent. Syst. iii. 1. pp. 10, 27; Don. Ins. China, pl. 24. f. 1; Lucas, Lep. Ex. t. 6. f. 2; Boisd. Sp. Gén. Lép. p. 201.

Hab. Java, Sumatra (Wall.), Borneo (De Haan).

Remarks.—The specimens from Sumatra are constantly larger than those from Java. The Indian form, in which the markings are red instead of yellow, with other differences, I consider a distinct species, for which I propose the name of P. Doubledayi, after the late Mr. Edward Doubleday of the British Museum[^[13]].

[13]. Papilio Doubledayi, Wallace. (P. Coon, var., B. M. Cat.)

Above: upper wings as in P. Coon, but the base darker. Lower wings broader than in P. Coon; the white spot in the cell toothed below, and divided by one or two faint blackish lines, cut off at the middle of the cell by the black triangular basal patch. The marginal spot next within the tail wanting; the two anal spots, end of abdomen, and its rings (which are yellow in P. Coon) red; collar behind the eyes and palpi (which are black in P. Coon) also red.

Beneath: base of lower wings broadly black; white spots all much broader and rounder than in P. Coon; sides of the thorax, end of the abdomen, and the marginal spots in the caudal and anal region red.