EVOLUTION OF COLOR PATTERN IN LITHOCOLLETIS. 131 



ment, there are four dorsal as well as four costal streaks. The apical dot is 

 present, dark brown and almost as large as in the imago and very definitely 

 outlined. Around the extreme apex, the scales projecting into the ciha are 

 tipped with brown, this color being deepest just opposite the apical dot but 

 quickly fading out on either side, so that it does not reach to the last pair of 

 white streaks. The apical spot and these few scales around the apex are the 

 only scales on the wing which show the slightest sign of brown; the bands are, 

 however, a little deeper yehow on their outer than on their inner borders. 



Very soon after the stage just described, the dark margin of the second dorsal 

 streak begins to develop; at this time, it consists of a few darker and shghtly gray- 

 ish tinted scales somewhat removed from the dorsal margin. The apical spot 

 is brownish black and seems to have reached its final development. The line 

 in the cilia, though darkest immediately opposite the apical spot, is plainly visible 

 from the fourth costal to the third dorsal streak, thus passing below the fourth 

 dorsal streak which at this stage has almost disappeared owing to the fusion of 

 Bands VI and VII. 



Very little change is now needed to reach the adult condition. The margins 

 of the second pair of white streaks continue somewhat in advance of the others 

 and reach their final stage of development a little earlier. All trace of a fourth 

 dorsal streak finally disappears. 



LithocoUetis lucidico Stella Clem. 



At the time of the first appearance of a pale yellow tinge upon the wings, 

 it is possible to discern faintly four bands in the apical half of the wing. Just 

 before the apex within the area occupied by Band VII is a smah colorless spot. 

 With the exception of the fact that these four bands are not connected along the 

 middle of the wing, the adult color areas (Fig. 44, PL III) are now laid down. 

 The dorsal portion of Band IV, the most proximal of these four bands, is con- 

 tinued toward the base, as in the adult, by a pale yellow streak along the fold. 

 Its costal portion is preceded by a white streak bordered internally by pale 

 yellow which is extended along the upper median vein to the base. 



The apical dot is the first dark mark to make its appearance. While the 

 yellow is still very pale, the scales of the formerly colorless spot near the apex 

 begin to take on a grayish tinge. The deepening of scales over this area seems 

 to take place in very much the same manner as that of the dark scales before the 

 apex in L. cratcegeUa. 



The apical spot continues to deepen and increase in extent, reaching its 

 adult condition before there is any indication of the formation of dark margins. 

 The development of the apical spot is accompanied by a gradual and uniform 

 deepening of the ground color together with the fusion of all the bands in the 

 middle of the wing and of VI and VII on the termen. The middle portions of 

 the wing between the apices of the white spots are somewhat paler, showing 

 where the pigment has recently appeared. 



