(6) Papilio pilumnus, Boisduval, Plate XXXVIII, Fig. 3, ♂ (Pilumnus).
Butterfly.—Resembling the preceding species, but smaller, having the bands and black margins of the wings decidedly broader, and the lobe of the anal angle of the hind wing so much lengthened as to give the wing the appearance of being furnished with three tails. Expanse, 3.80-4.30 inches.
Early Stages.—All we know of these is derived from the brief account given by Schaus in "Papilio," vol. iv, p. 100. Mr. Schaus says that the larva "feeds on laurel."
The insect is Mexican, and only occasionally occurs in Arizona.
(7) Papilio thoas, Linnæus, Plate XLII, Fig. 4, ♂ (Thoas).
Butterfly.—This species is readily distinguished from its near ally, P. cresphontes, by the greater and more uniform breadth of the median band of yellow spots traversing both the fore and the hind wing, and by the almost total absence of the curved submarginal series of spots on the primaries. There are other points of difference, but these are so marked as to make the determination of the species easy.
Early Stages.—These have never been fully described, but we know that the caterpillar feeds upon the leaves of the lemon, the orange, and other plants of the citrus group.
P. thoas is not common within the limits of the United States, where it is generally replaced by the following species; but it occasionally occurs in the hot lands of the extreme southern portion of Texas.
(8) Papilio cresphontes, Cramer, Plate XLII, Fig. 3, ♂; Plate II, Fig. 16, larva; Plate VI, Figs. 8-10, chrysalis (The Giant Swallowtail).