338 
Psyche 
[December 
The complex beige, brown, and black head pattern of the second 
instar persisted through all succeeding instars except the final one. 
With the final instar, regardless of the number of previous instars, the 
head capsule took on a new, less complex pattern (Figure 9, E and F) 
of brown and black. All larvae which attained this new head pattern 
pupated at their next molt. 
Head capsule widths, measured for all instars of each individual, 
indicate that size variation increased with each succeeding instar 
(Figure 10). However, the final instar, regardless of number (5th, 6th, 
7th), showed slightly less size variation than did the next to last instar, 
suggesting that once a larva has reached a certain critical size it molts 
to the final instar, and from there to the pupa. 
Body 
With growth, the body colors underwent gradual change and 
additional stripes were added continually. The yellow and green 
stripes passed through a pale and dark green stage, and finally 
became dark brown and dark green. In mature larvae they anas- 
tomosed slightly. 
The large dorsal spot changed from the pattern described for the 
first instar, to one with a greenish and black center, ringed with black, 
followed by pink-brown, pink, green, black (narrow), and green 
(Figure 1C). This pattern gave way to one with a black and green 
reticulated center, ringed with black (wide), pink (narrow), black 
(narrow), green (narrow), black (narrow), and green (medium) 
(Figure 7D). In mature larvae, the central black and green reticulate 
pattern was surrounded by a wide black ring, followed by rings of 
green, black, green, black (narrow and irregular), and green (wide) 
(Figure 7E). 
The smaller dorsal spot also changed with growth. Gradually the 
anterior white portion expanded and encircled the black, and the 
center became reticujated black and white. By maturity the small spot 
had become an exact miniature of the larger one. 
As larvae reached their full size, four smaller spots appeared, at the 
junctions of abdominal segments 1-2, 2-3, 4-5, and 6-7. Initially 
these spots were red-brown, but later changed to black. In addition, 
the nine pairs of spiracles showed as black spots along the sides of the 
body (prothorax, abdominal segments 1 through 8). 
Caudae 
From the second instar on, the caudae lacked apical setae, and 
