Mayer. — Wing Scales. 
PLATE 5. 
Figures 28, 29, Danais plexippus. Figure 30, Callosamia promethea. 
Fig, 28. Portion of a longitudinal section (i. e. parallel with the trend of the 
nervures) through the pupal wing, about eight or nine days before 
emergence. 
Fig. 29. Portion of a cross section (i. e. perpendicular to the trend of the nervures) 
through the pupal wing, about six days before emergence. 
Fig. 30. Portion of a longitudinal section through the mature wing about two 
hours after emergence. 
