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[LII.] Ptenirus, Scopoli. Dr. Scudder formerly selected 

 Papilla troilus, Linn , as the type of this "magazine" genus ; 

 but he afterwards withdrew it, and suggested P. troilus as the 

 type of E'.tphwadeS) in which we do not follow him. P. troilus 

 may be taken as typical of a small group of North American 

 Butterflies, measuring about four inches across the wings. The 

 fore- wings are narrower and more produced than in Achivus, 

 the hind-margin being much more oblique ; and the hind-wings 

 are more rounded, with a broader, but not spatulate tail. The 

 wings are black, often more or less suffused with blue, and are 

 frequently marked with rows of yellow spots, or narrow yellow 

 bands, and there is a red eye-spot at the anal angle. On the 

 under side the outer half of the hind-wings is marked with 

 red and blue spots and streaks. The typical P. troilus (Linn.) 

 measures 3^ inches across the wings, which are black, with 

 small greenish-yellow sub-marginal lunules ; the hind-wings 

 are dusted with bluish-grey on the disc, and there is a small 

 orange eye-spot at the anal angle. The under side of the 

 fore-wings has a yellow spot at the end of the cell and 

 two rows of yellow sub-marginal spots ; the hind-wings are 

 brown, with two rows of orange-red spots (the innermost row 

 large and nearly round), the space between the bands being 

 dusted with bluish-grey. It inhabits the Southern United 

 States. A closely allied, and much more widely diffused species 

 is P. ilioneus, Smith and Abbot, in which the spots are yellower, 

 and the blue dusting more extended, sometimes as far as the 

 lower half of the fore-wings ; towards the tip of the costa of 

 the hind-wings is a large orange spot above. The larva is 

 green above and reddish below, the colours being separated 

 by a yellow lateral line ; there is a black collar, and on the 

 third segment two pink spots containing black spots marked 

 with a blue ring ; and on the fourth segment are two smaller 

 pink spots pupilled with white. The hinder segments are 



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