_Imported Cabbage Butterfly_ (_Pieris rapae_). Expanse 2 inches. Upper surface white with a black marginal dash on the front outer angle of the front wing. One round black spot on each of the four wings in the male. Two round spots on each of the front wings in the female and one round spot on each of the hind wings. Under surface of hind wings yellowish white; spots on front wings in same position as on upper surface. A spring form (_immaculata_) is smaller and the black spots are almost obsolete. _Gray-veined White_ (_Pieris napi_). Expanse 2 inches. Upper surface white with only a darker marginal splash next the body. Under surface white with gray veins. _Checkered White_ (_Pontia protodice_ or _Pieris protodice_). Expanse 2 inches. Upper surface white, strongly marked especially in the female with dark grayish brown on both pairs of wings. Along the outer margins these marks are so arranged as to enclose white diamond spots. Male with front wings only lightly marked and hind wings scarcely marked at all. Under surface much like upper, with a slight yellowish tinge in female. _Great Southern White_ (_Pontia monuste_ or _Pieris phileta_.) Expanse 2 1/2 inches. General color white with a narrow black margin around apical angle of front wings. These margins are wider in the female, in which sex there is a series of marginal spots on the hind wings. Easily known by its large size. THE TRIBE OF THE ORANGE-TIPS When one sees a gossamer-winged butterfly flitting from flower to flower on a bright June day it seems one of the most ethereal of earth's visions. One could readily fancy that the whole sight--flowers, butterflies, and all--might easily vanish into thin air. So it is something of a shock to hear scientists talk about fossil butterflies and to realize that these fragile creatures have been living generation after generation for untold millions of years. A realization of this fact, however, helps us to understand the many wonderful ways in which butterflies in all stages of their existence have become adapted to the conditions of their lives.