138 EVOLUTION OF COLOR PATTERN IN LITHOCOLLETIS. 
cilia belonging to Band VII are all yellow with a few white scales here and 
there extending into them. Bands VII, V + VI and IV are somewhat deeper 
than Band III; Bands I and II are very pale, their paleness being caused by 
the large admixture of colorless scales at this stage. 
In the next specimen examined, apart from a slight deepening of Band III 
and those beyond it, the only changes observed are the following. The two basal 
patches on the costa, belonging to Band I, show a slight admixture of brownish 
tipped white scales. The third patch (Band II) is now faintly continued to 
P the dorsum by a line of scattered yellow scales, and just 
чы IT MD beyond it, in the position normally occupied by the 
| 4 x = outer margin of Band II, is an angulated line of very 
E a S ` faintly yellow scales. This marks the original outer 
Vio, d limit (phylogenetieally) of Band II. Just before the 
гайд pra brr fos tip of vein 1b is a similar line of scales running parallel 
ui Карай. © to the dorsal arm of Band III and marking its outer 
limit. These two lines of scales sometimes do not ap- 
pear until a much later period in the development. Their time of appearance 
is largely determined by the number of yellow scales mingled with the dark 
scales in the adult, since it is only in the yellow scales that the pigment ap- 
pears early. 
In the next stage studied (Fig. 22), Bands I and II in the basal part of the 
wing remain practically unchanged. Band III is the same in extent, but its 
color has deepened. Its internal margin is beginning to form, the scales adjacent 
to the yellow becoming gray tipped. The gray pigment appears directly in 
the whitish uncolored scales of the previous stage without passing through any 
of the intermediate steps. In general, the margin is broadest on the costa, be- 
coming narrower and paler below it, and not easily distinguishable toward the 
dorsum. On its inner edge, the margin is straight or slightly curved as in the 
imago; on its outer side, the scales project into the angle of the band and fill 
up the formerly colorless space. The tips of these scales are darker than those 
of the margin elsewhere. In this specimen, there are only a few scattered yellow 
seales beyond Band III and no indication whatever of the dark line of scales 
which is to appear later. The internal margin of Band IV is well marked on its 
dorsal half, consisting of several rows of dark tipped scales as in the imago. It 
eurves between the two yellow patches, extending to their apices, but not beyond 
them into the colorless fascia. The costal half of the margin consists only of a 
few pale gray scales and does not quite reach the dorsal half of the margin. 
Except for a few very faintly grayish scales above the termen on the inner edge 
of the dorsal part of Band V + VI, there is no indication whatever of any dark- 
ening of scales adjacent to Band V + VI. Belonging to Band VII, and begin- 
ning just behind vein 7, the scales covering the entire apex of the wing are gray 
tipped. Some of them, especially on the costal margin, project over the yellow 
scales which are to form the line in the middle of the cilia. The gray tipped 
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