PAPILIONIDJE. 
337 
their surface, can be but partially appreciated from what is shown in 
the accompanying figure. The insect is so dark that it looks at first 
sight like a very large and fine Papilio troilus. A closer inspection 
reveals the true character of the creature, as the dark bands so con¬ 
spicuous on the common form can be faintly seen on the under side 
of the wings of this variety. 
Papilio glaucus. Under side. 
The larva feeds on apple, birch and wild thorn, and is green in 
color, with two eye-like spots on the thorax. It resembles the larva 
of Papilio troilus , of which a figure is given on page 351. It is a 
rather difficult creature to find, and its chrysalis, which is usually 
attached to a twig or branch, is gray and brown in color and looks 
not unlike a piece of loosened bark. 
Papilio rut-ulus very closely resembles Papilio turnus , and takes 
the place of that species on the western half of the continent. The 
females never assume the dark color of the dimorphic form of 
