PL. CVII
(2) Colias eurytheme Boisduval, [Plate CVI], Fig. 1, ♂; [Plate CVII], ♀; form keewaydin Edwards, [Plate CVI], Fig. 2, ♂ (The Orange Sulphur). (See pp. 182 and 183.)
This is a form which is known to be very strongly polymorphic, having quite as many varieties and races as Lycæna pseudargiolus, for instance. C. keewaydin is a large winter form, which has the wings strongly washed with orange; there is a small winter form called C. ariadne, which is also laved with orange, though not so strongly. There is another form called C. eriphyle, which belongs to the summer brood, which has no orange on the wings, but is plain yellow; and there are still other forms. Expanse 1.60-2.15 inches.
The Orange Sulphur has a wide range, extending from the Atlantic to the Pacific, and from Canada to the northern portions of the Gulf States, though not invading the hotter parts of these states.
Genus TERIAS Swainson
(The Yellows).
Small butterflies, generally some shade of orange or yellow, with wings more delicate in structure than most of the genera belonging to the Pierinæ. Both wings generally rounded, but in a few species produced at the apex of the fore wing and at the end of the second median nervule of the hind wing. Eggs spindle-shaped, much swollen at the middle. Larva cylindrical, with a very small head, and the three first segments larger than those after them giving the body a humped appearance in front. Chrysalis compressed laterally, with the wing-cases forming a deep keel on the ventral side, more pronounced than in any other American genus, except Catopsilia.
This is a very large genus represented by many species in the tropical and subtropical regions of both the eastern and western hemispheres. Many of the species are dimorphic or polymorphic, and there is a vast deal of confusion as to their classification.
PL. CVIII
(1) Terias nicippe (Cramer), [Plate CVIII], Fig. 1, ♂; Fig. 2, ♀ (The Small Orange). (See Plate on [p. 184.])