134 EVOLUTION OF COLOR PATTERN IN LITHOCOLLETIS. 
V, VI and VII are still separated from one another by curved white fascize 
extending entirely across the wing and into the cilia (Fig. 18). The second 
pair of white streaks are still connected, but Band IV is beginning to project 
into them in the middle of the wing. At this time the 
=." ground color of the wing is a pale straw and lacks alto- 
E X95 gether the golden brown of the adult. The internal 
3» = »- margins of the first and second dorsal streaks are begin- 
Fic. 18. Wing of L. hageni at ning to form. Тһе inner edges of the bands, border- 
a E a of the dark ing the streaks outwardly, present much the same 
appearance as they do in species where the white 
streaks never acquire external margins; that is, the ground color fades gradu- 
ally into the white. 
A dark line in the cilia begins to form soon after this; the scales showing 
the brown pigment at this time are not those which will be bluish iridescent in 
the imago; these latter remain pure white and only acquire their pigment later. 
In the third specimen studied, the extent of the white streaks has been finally 
limited, and the golden brown color of the adult has been attained. All of the 
internal margins of the streaks, the dark scales at the apex of the first dorsal 
streak, those connecting the tips of the second pair of streaks and the two leaden- 
colored lines of scales running across the wing from the tips of the third and 
fourth eostal streaks are present. In addition, external margins are present 
on the white basal patch and on the first dorsal streak. АП of these borders 
are as they will appear in the adult. In this specimen, there was no indication 
of a deepening along the upper side of the basal patch. However, this obser- 
vation cannot be accepted as altogether reliable in indicating the time of appear- 
ance of the margin of the basal streak, since the specimen was evidently ab- 
normal, the apical dot not being present. No other specimens were available 
to decide the point. Imagoes of this species are occasionally found which lack 
both the apical dot and the dark margin along the upper side of the basal patch. 
LW түү 
Lithocolletis esculisella Cham. 
The species heretofore studied have been those belonging to the group 
having cylindrical larve and characterized by the principal margins of the 
white streaks being internal. This species (Fig. 70, Pl. IV) and those following 
have the so-called flat type of larva, and the white streaks of the imagoes have 
their darkest margins on the outer side. That is, in the former group, the 
tendency is for the color bands to acquire first, dark margins on their outer 
edges; in the latter group, the condition is reversed, and the dark color appears 
first on the inner edges of the bands. 
In L. esculisella, at a period when there is scarcely any differentiation 
between ground color and bands, the pattern appears to be laid down almost as 
in the adult (Fig. 19). The bands are very pale buff, and judging from their 
uniform color, appeared simultaneously. The pale shade at the base which 
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