130 EVOLUTION OF COLOR PATTERN IN LITHOCOLLETIS. 
The adult coloration appears to be attained several hours previous to 
emergence. At this time the markings are plainly visible through the pupal 
envelope. The bluish iridescence in the cilia is now well developed. Obviously 
this is one of the last characters to appear ontogenetically. 
Lithocolletis ostryzefoliella Clem. 
This species (Fig. 23, Pl. III) possesses an apical dot in its typical condition, 
composed of small black or blackish brown scales arranged in an almost circular 
shape over the tip of the wing. 
In the youngest specimen examined, the wings were dissected out at a period 
when they were losing their whitish appearance and becoming faintly banded. 
The last four bands are straight and placed transversely 
on the wing, leaving colorless bands between them. The 
basal portion of the wing is exceedingly pale, and the 
m ground color is scarcely discernible on the otherwise 
Fic. 14. Early stage in the colorless wing. The configuration of the color areas is 
development of color in thewing much the same as in the adult, there being the same 
of L. ostryefoliella. i : 
outward angulation of Band III, internal to the first 
pair of white streaks. A stripe along the middle of the wing and a white spot 
on the dorsal margin remain colorless and mark the position of the basal streak 
and the white dorsal spot in the adult. 
At a slightly later stage, the markings just referred to have become a little 
more distinct; the color is still a very pale straw (Fig. 14). The extreme base of 
the wing, while very pale, is still sufficiently contrasted with the unpigmented 
areas to show the outline of the basal streak defined for its whole length. On 
the dorsal edge, a pale shade broadest on the dorsal margin reaches two-thirds 
of the way across to the basal streak. On the basal side of this spot, the ground 
color seems a little deeper. Band III, although much angulated outwardly, is 
not yet connected in the middle of the wing with Band 
IV; thus the first pair of white streaks are still con- 
nected and form an angulated fascia, broadest at its ' 
extremities. Bands IV, V, VIand VII remain entirely | E 
separate and retain their primitive straight edges, with Ес. 15. Later stage in the 
the exception of the inner edge of Band IV which has ортеп? of color in the Tn 
of L. ostryefoliella. 
been somewhat produced toward the base at its ex- 
tremities. Band III and Band VII are possibly a shade darker than the other 
portions of the wing; the scales attached around the apex projecting into the 
cilia are, however, paler and concolorous with Bands IV, V and VI. 
The ground color continues to darken, reaching its adult condition at a 
relatively earlier stage than is the case іп L. crategella. At the same time (Fig. 
15), the pale yellow spreads onto places originally unpigmented; thus the bands 
become connected by a paler yellow shade, so that the white fasciz are trans- 
formed into pairs of opposite narrow white streaks. At this stage in the develop- 
ТЛ, dA 
LII, Hf IV Y VI y 
