6 NORTH AMERICAN BUTTERFLIES, 



oa. Papilio machaon aliaska Scud. Similar to P. machaon, but 

 the hind margins to the hind wings are decidedly convex, the black is 

 darker, less dusted with yellow scales, and there are decided black edg- 

 ings to the veinings. Habitat, Western North America, from Oregon, 

 northward, through British America, into Alaska. 



4. PAPILIO OREGONIA Edw 



Oregon Swallow-tail. 



Similar to P. machaon but larger with the yellow areas narrow, the 

 wings narrower and more produced, the black borders of hind wings 

 broader, the tails longer, and the central spot in the orange area on inner 

 angle of hind wing is more central, and has a decided bulb at its extrem- 

 ity, Fig. 5, g. Expands from 3.00 to 4.00. 



Habitat, Oregon, Washington Territory, and Vancouver's Island. 



0. PAPILIO ZOLICAON Bd. 

 Black and Yellow Swallow-tail. 

 Similar to P. machaon but differs in being smaller, the yellow is 

 darker, being rather more orange, the dark areas are darker, especially 

 at the base of the fore wings, and above all the black center to the or- 

 ange on secondaries is oval and completely isolated, Fig. 6, e. Margin- 

 al spots on lower side of hind wings, orange. Expands 3.00 to 3.25. 

 Habitat, Oregon to Arizona; Montana; Colorado. 



6. PAPILIO AMERICUS Koll. 

 Arizona Savallow-tail. 

 Similar to P. machaon in general coloration but with a black cen- 

 ter in the orange spot on the upper surface of secondaries ; sides of body 

 spotted as in P. asterias, instead of being lined as in P. zolicaon. The 

 marginal spots on the hind wings below are orange as in asterias, as are 

 also the spots constituting the central band of the under fore wings. 

 Expands about 3.00. Habitat, Arizona. 



7. PAPILIO NITRA Edw. 

 Pale Swallow-tail. 

 Size, small; tails of medium length and not expanded at tip, Fig.T), c. 

 Above, black, with a sub-marginal band of oval spots on both wings 

 and a broad central band on both wings, widest on the fore wings, in- 

 terrupted at the veins, and a triangular spot within this on the fore wings, 

 all of yellow rather paler than in P. tnrnns. Jietween these two bands 



