LEPIDOPTERA. 379 
is represented by both sexes, and is found in nearly all parts 
of the United States and Canada. 
(2) The Glaucus Form, Jasoniades glaucus glaucus .—In 
this form the disk of the wings is entirely black, but the 
black bands of the Turnus form are faintly indicated, espe¬ 
cially on the lower surface, by a darker shade. The mar¬ 
ginal row of yellow spots is present, and also the orange 
spots and blue scales of the hind wings. This form is rep¬ 
resented only by the female sex, and occurs only in the 
more southern part of the range of the species, i.e., from 
Delaware to Montana and southward. 
The Zebra Swallow-tail, Iphiclides ajax (Iph-i-cli'des 
a'jax).—This butterfly (Fig. 459) differs from all other swal¬ 
low-tails found in the 
eastern half of the 
United States in hav¬ 
ing the wings crossed 
by several bands of 
greenish white. This 
is one of the most in¬ 
teresting of our but¬ 
terflies, as it occurs 
under three distinct 
forms, two of which 
were considered for a 
long time distinct 
species. Without tak¬ 
ing into aCCOUnt the FlC - 459 -—Iphiclides ajax. 
more minute differences these forms can be separated as 
follows:— 
(1) The Early-spring Form, Iphiclides ajax marcellus 
(mar-cel'lus).—This is the form figured here. It expands 
from two and six tenths inches to two and eight tenths 
inches; and the tails of the hind wings are about six tenths 
inch in length and tipped with white. 
(2) The Late-spring Form. Iphiclides ajax telamonides 
