EASTERN UNITED STATES. 85 



and tlie outer end is not merely tipped with greenish 

 yellow, but bordered on each side from half to two- 

 thirds the distance from the tip to the base, and the 

 anteanal crimson bar is sometimes two spots. 



Summer form, Marcellus, Bd. — Expanse from 3.2 

 to 3.5 inches. This is black, with the light part blue- 

 green; the tail over an inch long and bordered with 

 yellow, and the anteanal crimson mark one or two spots 

 instead of a bar. 



All of these forms have the markings of the upper 

 side repeated beneath, with a more or less prominent 

 ci-imson stripe through the middle of the hind wings 

 nearly parallel to the inner margin. 



Of these three forms the last is the one found in 

 summer, and comes from chrysalides formed the same 

 season, while the others emerge from chrysalides that 

 have wintered over. They were originally described as 

 separate species, and were generally considered so till 

 Mr. Wm. H. Edwards proved their identity by breeding 

 the different forms. 



The eggs are deposited on the leaves of the pawpaw, 

 upon which the larvae feed. They are pale green, glob- 

 ular, smooth, .016 of an inch in diameter. The young 

 larva is black, covered with minute papillae, from each 

 of which proceed fine hairs. After the first moult it is 

 ash-colored, still covered with the papillse. These are 

 lost at the second moult, when the larva assumes the 

 general form and smooth skin which it shows at ma- 

 turity ; the color yellowish white, with transverse gray 

 stripes. After the third moult the color is smoky brown, 

 each segment crossed by four lines, of which the ante- 

 rior is yellow and the rest white ; the second, third, and 



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