EVOLUTION OF COLOR PATTERN IN LITHOCOLLETIS. 139 
scales of the apex, those between the two parts of Band IV and in the angle of 
Band III, are darker than the other scales forming the margins. 
In a specimen at a considerably more advanced stage of development, the 
scales composing the two patches at the base of the costa are entirely gray tipped 
and very much the same as they will appear in the adult. The colorless scales 
mingled with those forming the proximal part of Band II are beginning to be 
gray tipped; this is especially noticeable on the quadrate part above the upper 
median vein; below it, there is only a line of a few scattered gray tipped scales 
reaching to the dorsum. The line of scales beyond, forming the original outer 
limit to Band II, is pale gray tipped throughout and, though broader on the costa, 
is complete to the dorsum. The broadening of the internal margin of Band III 
has continued. Its external margin, separated from the yellow band by white, 
is indicated by a single line of pale gray tipped scales running from the costa to 
the cell. "The internal margin of Band IV has broadened and deepened and has 
now probably reached its adult condition. It is not possible to determine 
whether the development is completed in any single specimen, since there is a 
great deal of variation in the amount of dusting among the different individuals 
in this species. In this stage, the scales which in the imago are the most distal 
of those forming the dark external margin of Band IV are tipped with pale gray 
and connect with the dusting between the costal and dorsal parts of Band IV. 
Those on the inner side of the margin which will in a great measure fill up the 
white space between the margin and the yellow parts of the band are still un- 
colored. There is a very considerable patch of dusting internal to Band V + VI 
on the dorsal margin and connected with the apical dusting which has been 
extended proximally between the parts of V + VI. poU yp an 
The costal dusting is not nearly as dark and is some- CIRC ащ 
what scattered. In addition to the extension of the 
apical dusting proximally, there has been an increase S 
in the number of dark seales mingled with the cilia. Fic. 23. Wing of L. hamadry- 
The dark line through the middle of the cilia formed Фа near the end of the pupal 
by brown tipped yellow scales is now quite distinct. 
At this time, most of the dark markings are at least definitely defined in posi- 
tion; there is needed to bring them to their final state only a darkening of those 
scales already gray tipped and in some places the appearance of pigment in 
other scales adjacent to these. 
In a specimen to be described now, most of these characters have appeared 
(Fig. 23). The patches of dark gray scales at the base of the costa and the line 
of scales beyond the third of these patches have increased and darkened decidedly. 
The line of scales external to Band III has now become dark gray tipped. Ex- 
ternal to Band IV, the dusting has been extended toward the base, so that only 
a small white streak is left between it and the band on the margins. The dusting 
in the apex has been much increased and extends along the margin, especially on 
the costa, and connects with the internal dusting of Band V, thus almost obliter- 
ating the white streak over vein 7. 
