384 
THE STUDY OF INSECTS. 
northern portions of the United States. The larva feeds 
on cabbage. 
The Checkered White, Pontia protodice (Pon'ti-a pro- 
tod'i-ce).—The two sexes of this species differ greatly in 
appearance, the female being much more darkly marked 
than the male. The wings are white, marked above with 
grayish brown. There is a bar of this color at the end of 
the discal cell; beyond this there is in the male a row of 
three more or less distinct spots, and in the female an 
almost continuous band of spots. Besides these there is in 
the female a row of triangular spots on the outer margin of 
both fore and hind wings, and on the hind wings a submar¬ 
ginal zigzag bar. 
The larva of this species is colored with alternating 
stripes of bright golden yellow and dark greenish purple, 
upon which are numerous black spots. It feeds upon cab¬ 
bage and other cruciferous plants, and occurs in nearly the 
whole of the United States. Both this and the preceding 
species seem to become greatly lessened in numbers by the 
increase of the imported Pieris rapce. 
II. The Orange-tips. —These, like the butterflies compris¬ 
ing the preceding group, are white, marked with black. 
Their most characteristic feature is the presence on the 
lower surface of the hind wings of a greenish network, or a 
marbled green mottling. This usually shows through the 
wing so as to appear as a dark shade when the wings are 
seen from above (Fig. 463). Many species have a con¬ 
spicuous orange spot on the api¬ 
cal portion of the front wings. 
This has suggested the common 
name Orange-tips for the group. 
But it should be remembered 
that some species lack this 
mark, and that in some others it 
is confined to the males. Nearly 
all of our species are confined to 
the far West. The two following occur in the East. 
