8 PROCEEDINGS OF THE NATIONAL MUSEUM vol. 81 



Season. — July and August. 



Co77iparisons. — Papilio machaon hudsonianus is very closely related 

 to typical P. in. machaon of western Europe, from which it differs 

 in the slight, but characteristic, convexity of the outer margin of the 

 fore wings, in the shorter tails, in the generally duller color, in the 

 excavation of the orange anal ocellus by the thickening of its black 

 posterior border, and in the small size and isolation of the black spot 

 on the fore wing in the yellow triangle between veins SC4 and SC5. 



Among its American relatives it is perhaps most easily confused 

 with Papilio halrdi form oregonia. But the convexity of the outer 

 border of the fore wings, the short tails, the deeper color, the small 

 size of the black spot connected with the orange anal ocellus, which 

 lies on its lower border instead of being more or less completely within 

 it, the narrower dark border of the hind wings, and the usvially 

 greater extent of the broad dark abdominal border of the hind wings 

 serve to distinguish it. 



PAPILIO MACHAON PETERSII, new subspecies 



Plate 4 ; Plate 5, Fiqube 3 ; Plate 6, Figure 3 



Description. — Closely related to P. m. hudsonianus., with the same 

 wing shape and the same short tails, but somewhat smaller (the fore 

 wing 37 mm long) and darker yellow. 



On the upper side the fore wings have the dark border very slightly 

 narrower, and there are almost no olive scales in the black basal 

 23ortion. 



On the hind wings the orange anal ocellus is circular and is bor- 

 dered, except for a short sector one end of which adjoins the outer 

 half of the lower end of the dark margin, by a narrow black ring, 

 which is about twice as broad above the ocellus as elsewhere. 



On the under side the yellow is deeper than in P. in. hudsonianus., 

 especially on the hind wings. On the fore wings the submarginal 

 spots are united into a broad band with straight borders crossed by 

 hairlike black veins, and the dark border is narrower than on the 

 upper surface. The yellowish scaling on the black basal portion of 

 the wing is confined to the cell, where it is less extensive than it is in 

 P. m. hudsonianus. 



On the hind wings the submarginal lunules are larger and the dark 

 border is slightly narrower, the inner ends of the lunules lying about 

 midway between the edge of the wing and the inner edge of the dark 

 border instead of nearer the former as in P. m. hudsonianus. 



Type specimen. — ^U.S.N.M. No. 34479, male (pi. 4), from the 

 Koyukuk River, central Alaska (lat. 67°-69° N., long. 151° W.), 

 captured in the summer of 1901 by Capt. W. J. Peters, now of 



