BULLETIN 609, U. S. DEPARTMENT OF AGRICULTURE. 



THE ADULT. 



(Fig. 1, a; fig. 3.) 



The general color of the upper surface of the body and wings of the moth 

 is light yellow, the wings iridescent. A dark grayish-brown band begins at 

 the humeral angle of the forewing, from which it extends to the eye, and con- 

 tinues along the costal and outer mar- 

 gins of this wing and the outer margin 

 of the hind wing. On either wing this 

 band is widest at the apex. Inside the 

 band and about one-sixteenth of an inch 

 from it a wavy line of the same color 



Fig. 2. — The sweet'potato leaf-folder: a, 

 First three joints of larva, showing 

 legs and arrangement of spiracles and 

 spiracular tubercles ; h, lateral view of 

 a ventral segment ; e, pupa, ventral 

 view. All greatly enlarged. (Original.) 



Fig. 3. — Wing venation and lateral 

 view of head and antenna of a re- 

 lated species, Pilocrocis ram'entalis, 

 to show characters of genus. 

 (Hampson.) 



crosses both wings. Two black spots occur on the forewing, near the 

 costal margin. The outer and larger one is near the middle of the margin 

 and the smaller one about halfway between this and the base of the wing. 

 A short, wavy, dark grayish-brown line occurs just inside this small black 

 spot, extending backward from the band on the costal margin to a point about 

 halfway across the wing. There is also a small black spot on the hind wing, 

 near the costal margin and about halfway between the base of the wing and 

 the wavy line previously noted. The markings are shown in figure 1. a. 



The underside of the wings is lighter in color than are above, but have 

 the same iridescent reflection with indications of the markings of the upper 

 surface. 



The ventral surface of the thorax and abdomen is white. The antenna? 

 are light yellowish brown, and the legs white, except that the anterior sur- 

 faces of the first pair are for the most part of a dark grayish brown. 



In the male the abdomen tapers more gradually to the posterior end than is 

 the case in the female. The upper surface of the thorax also presents a more 

 hairy appearance in I lie male, owing to the longer hairs of the tegulse or lappets. 

 With a lens a third point of difference is seen in the short bristles present on 

 the underside of the basal portion of the antenna; of the male. These do not 

 occur on the antenna' of the female. 



