Mayer. — Wing Scales. 
eos 
PLATE 3. 
Figures 11-16, Danais plexippus. Figure 17, Callosamia promethea. 
Portion of a longitudinal section through a pupal wing about five days 
before emergence. 
Portion of a longitudinal section through a pupal wing about seven days 
before emergence. 
Diagrammatic longitudinal section of a wing to show the cross folds in 
the pupal wing membrane. 
Diagrammatic longitudinal section to show the flattening that affects the 
wing membrane after emergence. 
Diagrammatic cross section of one wall of the pupal wing to show the 
longitudinal folds of the wing membrane. 
Diagrammatic cross section of the mature wing, the longitudinal folds 
being obliterated. 
Cross section of a scale of Callosamia promethea. 
