42 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 95 



segments disappear. The second thoracic segment, which ordinarily 

 is of about the same size as the third, becomes enormously swollen 

 so that it is larger, though not broader, than the last thoracic and 

 first abdominal segments together, and the skin covering it becomes 

 exceedingly taut. 



The color changes to a fairly uniform apple green, somewhat deeper 

 green on the second thoracic and last three abdominal segments and 

 slightly more yellowish elsewhere. The conspicuous yellow lateral 

 stripe and the yellow spots completely disappear. The bright pink 

 of the first thoracic segment fades to a light putty color with scarcely 

 a trace of pink, and the brilliant chrome spots on the head fade to 

 a dull deep putty color and become inconspicuous. 



After a quiescent period of about 2 days the head spHts along the 

 median groove between the epicrania and down the suture between 

 one of the epicrania and the adjoining adfrontal. The dorsal thoracic 

 shield splits across in the middorsal line, and the skin of the dorsal 

 surface splits down the median line as far as the fourth abdominal seg- 

 ment, or just above the second pair of prolegs. By intermittent wrig- 

 gling the larval skin is shoved backward and compressed into a small 

 bundle at the end of the body, drying out with extraordinary rapidity 

 during this process. By further wriggling the cremaster is freed from 

 the larval skin and entangled in the button of silk on which the pos- 

 terior prolegs of the caterpillar previously rested. 



PUPA 

 Plate 5, figs. 19-25 



Immediately after its formation the pupa is a brilliant transparent 

 green on the wing covers and thorax, with the abdomen a very light 

 yellow clay color, almost straw yellow, becoming greenish at the tip. 

 The eye is bordered posteriorly with a curved row of small bright red 

 spots. Between the prothoracic spiracles are two fine transverse lines 

 of bright red, one on either side of the median line. The anterior 

 border of the thorax is pinkish. The prothoracic spiracles and the 

 cremaster are dark brown, the former soon becoming blackish. 



Within an hour the pupa begins to darken, the abdomen and head 

 becoming gradually yellow brown and the wing covers and thorax 

 olive green, darkest on the dorsal portion of the thorax and the 

 anterior half of the wing covers below. In about 4 hours the abdomen 

 has become orange brown, darkest posteriorly, the head orange brown 

 with a tinge of olive green, and the thorax and wing covers bright olive 

 green, lightest on the posterior half of the wing covers ventrally. 



