LEPIDOPTERA, 



379 



is represented by both sexe^, and is found in nearly all parts 

 of the United States and Canada. 



(2) The Glaucus Form, Jasoniades glaiicus glaiicus. — 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 pfesent, 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. 



CThe 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 

 e^reenish 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 ^^^- 459.-//^«v/zV^^ ajax. 



more minute differences these forms can be separated as 

 follows : — 



(i) The Early-spring Form, Iphiclides ajax marcellus 

 (mar-cerius). — 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 



