New York Agricultural Experiment Station. 551 



The adult insect is a beautiful steel-gray moth which measures 

 nearly one-half of an inch from tip to tip when the wings are 

 spread. The front wings are flecked with white scales on the 

 basal half. Frequently these white scales are very numerous on 

 the wings of- the female and almost lacking on the wings of the 

 male. Other striking characteristics are the rings of dark and 

 white scales on the antennae and legs and the tufts at the bases of 

 the antennae. The males are a little smaller on the average than 

 the females and of a somewhat darker color. The moths fly at 

 night and hence are not usually seen. Plate XLII, fig. 1, repre- 

 sents one of the moths enlarged. 



The eggs. — We did not observe the exact time of egg-laying, 

 but found eggs on the leaves late in June. These were on the 

 under surface of the leaves. They were placed singly, most of 

 them near the midribs and larger veins. Although they are very 

 small, the eggs are plainly visible to the unaided eye if one knows 

 what to look for. They are yellowish-green in color, nearly cir- 

 cular at the base, smaller, and with a slight depression at the 

 upper end. Parallel depressions and ridges extend along the full 

 length of the sides. Plate XLII, fig. 2, a and b, represent an 

 upper view and a side view of an egg greatly enlarged. The eggs 

 evidently hatch in about ten days or two weeks. 



Habits of the ymmg case-bearers. — We did not observe the exact 

 limits between which egg hatching might occur. Early in Au- 

 gust, however, the recently hatched case-bearers were found on 

 the under surface of the leaves. The cases were made of excre- 

 ment and silk presenting, when viewed under the microscope, the 

 rough appearance represented in Plate XLII, fig. 4. The cater- 

 pillars were feeding on the soft tissues between the two surfaces 

 of the leaves. When one of them was forcibly removed, the small 

 round hole made through the skin of the leaf was plainly visible. 

 September 5 the young case-bearers appeared, when feeding 

 on a leaf, as shown in Plate XLII, fig. 3. At this time they meas- 

 ured, on an average, about one-eighth of an inch in length. From 

 this time on they grew but little and soon migrated to the twigs 

 to remain during the winter, attaching their cases to the bark as 

 previously shown in Plate XL, fig. 1. 



