128 EVOLUTION. OF COLOR PATTERN IN LITHOCOLLETIS. 
pale yellowish and but little differentiated from the colorless wing, the pattern 
strikingly resembles that of the adult insect. "The white basal streak is distinctly 
outlined, beginning at the base of the dorsum, where it seems to be homologous 
with the white streak separating Bands I and II, be- 
vond this lying over a trachea which extends through 
the cell just above the middle; its tip seems to coincide 
' i. with some portion of the white fascia separating Bands 
Fic, 12. Early stage in the Папа. The white patch near the base of the dorsum 
x EK colorin the win£ < identical with that in the adult and with the apex of the 
basal streak seems to constitute the last vestige of the 
white fascia separating Bands II and III. On the dorsal margin, the outer edge 
of Band III has shrunk away toward the base, and at the same time, there has 
been a compensating extension of Band IV toward the base, resulting in a dis- 
placement of the white streak, so that instead of being over vein 15, it is basal 
to it, and vein 15 reaches the margin well within Band IV. The first pair of 
streaks are already separated by a narrow line, which is not nearly as broad 
internally as in the imago. At this stage, the costal white streak is not much 
narrower on the margin than the dorsal. Bands V, VI and VII are situated 
normally, except that V on the dorsum extends a little basally over the tip of 
vein 2. "These bands, while quite distinet on the margins and in the cilia, seem 
to fade away in the middle of the wing. "The entire middle of the wing, from the 
tip of the first dorsal white streak almost to the extreme tip of the wing, remains 
colorless, so that it is not possible to distinguish the bands from the interspaces 
separating them. A comparison with the adult shows that this area coincides 
with that to be occupied by the dark streak of scales through the middle and 
by the apical patch of black scales. 
In a specimen somewhat more advanced, there has been a slight deepening 
of color, but by no means, even in the golden color, has the adult shade been 
attained. The color is still yellow, with no tinge of brown, unless the slight 
darkening of the dorsal side of Band IV, especially toward the second white 
streak, may be regarded as a foreshadowing of that color. The middle of the 
wing from the tip of the first dorsal streak almost to the apex (except for the 
grayish black scales to be noted below) still retains its whitish appearance. 
Just before the apex and beginning just under the tip of vein 7, and extending 
for a short distance along the underside of 7, are a number of grayish black 
scales. These appeared first beneath the tip of 7 and were gradually extended 
toward the base. The patch is broadest toward the apex, where it reaches al- 
most across the wing. The inner edges of the first pair of streaks are more curved 
than in the preceding specimen as a result of the broadening internally of the 
yellow line separating them. The scales attached around the apex are yellow 
and extend in an unbroken line to the second dorsal streak, that is, Bands V, 
VI and VII have united along the termen. However, the seales whose apices 
project beyond these and which are destined to constitute the iridescent blue 
line in the cilia still remain pure white. 
IILI 
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