BUTTERFLIES OF MONTANA. 



19 



Fig. 16. Venation of Papilio. 



SUBFAMILY PAPILIONINAE. 



Large species, hind wings tailed. Ground 



color of the wings black, usually marked with 



yellow, and often with metallic blue or green, 



or yellow marked with black. Papilio. 



Genus PAPILIO, Linnaeus. 



Butterfly — There is great diversity of form 

 in the wings of this genus. They are large 

 butterflies, often known as swallow tails. The 

 wings are ample; the fore wings triangular; 

 the hind wings concave next to the body, and 

 usually provided with a tail-like appendage 

 before the anal angle; outer margin dentate. 

 See Fig. 16. 



Early Stages — The eggs are somewhat glob- 

 ular, flattened at the base, and smooth. The 

 caterpillars are cylindrical, fleshy, thicker in 

 the anterior portion of the body. 



There aje about twenty-seven species of this 

 genus found within the limits of boreal 

 America. 



4. 



KEY TO SPECIES OF PAPILIO. 



Ground color yellow, with black bands. 2. 



Ground color black, with whitish yellow or white bands. 3. 



One tail, rutulus. 



Two tails, daunils. 



One tail; base of fore wings black; an orange lunule with black 



ocelli on hind winks, 4. 



One tail; but little black at base of fore wing, whiter, 



eurymedon. 



One tail; base of fore and hind wings broadly black. nitra. 



Sides of thorax yellow. brucei. 



Sides of thorax black, zolicaon. 



Row of marginal spots on under side of fore wings blending rutulus 



Row of marginal spots on under side of fore wings separate 



turnus 



