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 glaucns 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 FlG - 459.-#**''* 

 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 



