84 THE BUTTERFLIES OF THE 



forked scent-organ which is capable of being thrust out 

 at will or withdrawn into a slit-like receptacle. When 

 extended, this organ gives off a disagreeable odor which 

 serves as a protection to the larva. 



1. Papilio Ajax, Linn. 



Expanse of wings from 2.6 to 3.5 inches. 



Upper surface of body and wings varying from pale 

 black to deep black, banded and marked with a color vary- 

 ing from greenish yellow to pale blue-green. These are 

 arranged in three bands common to both wings, the one 

 next to the body narrow, the third bifid on the fore 

 wings from the costa to the median vein ; and three 

 short bands not reaching farther than the median vein. 

 There is also a subterminal band on the fore wings 

 crossed by the black veins, and a row of spots on the 

 hind wings parallel with the outer margin. Body 

 blackish, with two whitish lines on the sides. 



There are three dimorphic forms of this species, and 

 one variety. The first of these is the winter form, 

 Walshii, Edw. — In this the black is pale, the light 

 parts greenish yellow ; the tail to the hind wings about 

 .6 of an inch long, black, tipped with light ; and the 

 red before the anal ocellus is a bent bar ; after the ocellus 

 are two blue lunules. . 



Var. Abbottii, Edw. — Expanse from 2.6 to 2.8 

 inches. This resembles the above, but has a more or 

 less distinct crimson streak on the hind wings nearly 

 parallel with the internal margin. 



Winter form, Telamonides, Feld. — Expanse from 

 2.8 to 3.2 inches. This is about the same in color and 

 markings as form Walshii, but the tail is a little longer, 



