EASTERN UNITED STATES. 213 



Head dull olive, with dense minute prickles; bilobed, 

 upon the vertices a pair of prickly horns. Back specked 

 and mottled above the stigmata with olive of different 

 shades, except joints 3 and 9 and the upper parts of 8 and 



10, but with a continuous pure white substigmatal line. 

 Below this, on joints 5 to 11, is a large olive patch, on 

 joints 7 to 10 extending to the tip of the prolegs. A 

 pair of black, transversely-arranged dorsal dots in the 

 sutures behind joint 3, and a more or less obvious lateral 

 one just above, and behind the sixth and eighth pair 

 of stigmata. Joints 4 to 8 and 10 to 12 with more or 

 less shining, elevated, blue dots. On joint 3 is a pair of 

 prickly, cylindrical, black horns, transversely 

 arranged, .16 of an inch long; on joints 4, FIG. 62. 



11, and 12, a pair of dorsal tubercles, each 

 crowned by a little bunch of from eight to 

 twelve prickles ; on joint 6, a pair of similar 

 tubercles, but larger and of a yellowish color ; 

 on joints 5, 7, 8, and 10, tubercles similar to 

 those on joints 4, 11, and 12, but smaller; on 

 joint 13, four black, prickly, dorsal horns. 



The pupa (Fig. 62) is similar in form to 

 that of L. Arthemis, and is marked with burnt 

 umber-brown, ash-gray, flesh color, and white. , 



The winter is passed in a hibernaculum consisting of 

 a leaf, similar to L. Arthemis, except when there is more 

 than one brood in a season. In this case it is only the 

 last brood that has a torpid state. 



The food-plants are apple, plum, willow, poplar, and 

 oak. 



United States generally. 



