_Butterfly._--The figure gives a correct idea of the upper surface of the male. The female on the upper side is marked with light-black spots on the outer margin near the apex. On the under side in both sexes the apex of the primaries and the entire surface of the secondaries, except a small spot on the costa, are profusely sprinkled with small brown scales. The veins of the hind wing are brown. Expanse, 1.65-1.95 inch. _Early Stages._--The caterpillar, which feeds upon _Turritis_, is green, shaded on the sides with pale blue, striped laterally with white, and covered with transverse rows of minute black points, each bearing a short black bristle. We know nothing of the other stages. The species ranges from northern California to Alaska. Genus CATOPSILIA, Hübner (The Great Sulphurs) "A golden butterfly, upon whose wings There must be surely character'd strange things, * * * * * Onward it flew, ... then high it soar'd, And downward suddenly began to dip, As if, athirst with so much toil, 't would sip The crystal spout-head; so it did, with touch Most delicate, as though afraid to smutch Even with mealy gold the waters clear." KEATS, _Endymion_. _Butterfly._--Large butterflies, brilliant lemon-yellow or orange-yellow, marked with a few darker spots and with a narrow band of brown, especially in the female sex, on the outer margin of the primaries. They are very quick and vigorous in flight, more so than is the case in any of the preceding genera. _Egg._--The eggs are spindle-shaped, flat at the base, and acutely pointed, with a few longitudinal ribs and a multitude of delicate cross-lines. _Caterpillar._--The caterpillar is relatively long, with the head small; the segments somewhat moniliform, resembling beads strung together, the surface covered with a multitude of minute papillæ ranged in transverse rows. _Chrysalis._--The chrysalis is strongly concave on the dorsal side, with the head greatly produced as a long, pointed, conical projection; the wing-cases are compressed and form a very wide, keel-shaped projection on the ventral side. This peculiar formation of the wing-cases reaches its greatest development in this genus. The butterflies of this genus are mainly tropical. Four or five species, however, are found in the warmer parts of the United States, and one of them ranges north as far as northern New Jersey, and has been occasionally taken even in northern Illinois. [Illustration FIG. 144.--Neuration of the genus _Catopsilia_.] (1) =Catopsilia eubule=, Linnæus, Plate XXXIII, Fig. 2, ♂; Fig. 3, ♂, _under side_; Plate II, Figs. 2, 4, _larva_; Plate V, Figs. 60-62, _chrysalis_ (The Cloudless Sulphur).