THE SWEET-POTATO LEAF-FOLDER. 3 



The following synonymy is recorded : 

 Phalaena tripunctata Fabr. 1794. 

 Botys cubanalis Guen. 1854. 

 Botys memmialis (F.) Walker. 1859. 

 Pilocrocis tripunctata Fabr. (Ffampson). 1898. 



DESCRIPTION OF STAGES. 



THE EGG. 



(Fig. 1, b.) 



Thin, scalelike, with delicate walls, reticulated on upper surface; more or 

 less regularly elliptical in outline, especially when laid singly. Being very 

 plastic, the eggs vary considerably in shape. When laid the egg is at first 

 colorless, practically transparent, and later the developing embryo can be seen 

 plainly within. Measurements of 10 eggs that had been deposited singly: 

 Average length, 1.06 mm., average width, 0.79 mm. 



THE FIRST LARVA STAGE. 



Of a number of larva? examined, none of which was more than 24 hours 

 old, the smallest measured about 1.5 mm. in length. The width of the head 

 shield of all these individuals was very constant, about 0.25 mm. 



Newly hatched larvse are opaque, colorless, except for the dark, reddish- 

 brown ocelli and the mouth parts, which are tinged faintly with brown. The 

 body is cylindrical in shape, the surface smooth, glistening, with the setae arising 

 from colorless tubercles. In these newly hatched larvae the head and legs are 

 comparatively large, noticeably out of proportion to the rest of the body. After 

 emergence from the eggs, however, the larvse begin to increase rapidly in size, 

 and this lack of proportion is soon lost. When .the larvae begin to feed the 

 chlorophyll taken into their bodies imparts to them a greenish tinge. 



LATER LARVA STAGES. 



(Fig. 1, c, d; fig. 2, a, b.) 



During the succeeding instars the shape of the larva remains cylindrical, 

 the surface smooth and glistening. In the third and subsequent instars tubercle 

 ii of segments 3 and 4 1 is usually conspicuous because of its brorvnish or 

 blackish color. Sometimes, however, especially on segment 4, the tubercle is 

 not dark. 



When at rest the full-grown larva measures, immediately after feeding, 

 about 27 mm. in length and 5 mm. in width. Measurements of the width of 

 the head shields of 10 individuals gave an average of 1.81 mm., ranging from 

 1.75 mm. to 1.88 mm. The general color of the larva is bluish green. The 

 head (fig. 4) is pale yellow, and the ocelli, tips of the antennae, mouth parts, 

 and claws of the true legs are brown. 



THE PUPA. 



(Fig. 1, e; fig. 2, c.) 



The pupa is dark brown in color, somewhat lighter toward the posterior 

 end. The surface is smooth, that of the abdominal segments dull and the re- 

 mainder glistening. Eight bristles, curled at their tips, occur at the end of 

 the cremaster. 



Five pupa? averaged 15 mm. in length and 4 mm. in width at the widest point. 



1 The head is considered as segment 1, the prothorax as segment 2, and the others 

 in succession. 



